2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
24 #include <linux/pagemap.h>
25 #include <linux/highmem.h>
26 #include <linux/time.h>
27 #include <linux/init.h>
28 #include <linux/string.h>
29 #include <linux/backing-dev.h>
30 #include <linux/mpage.h>
31 #include <linux/swap.h>
32 #include <linux/writeback.h>
33 #include <linux/statfs.h>
34 #include <linux/compat.h>
35 #include <linux/aio.h>
36 #include <linux/bit_spinlock.h>
37 #include <linux/xattr.h>
38 #include <linux/posix_acl.h>
39 #include <linux/falloc.h>
40 #include <linux/slab.h>
41 #include <linux/ratelimit.h>
42 #include <linux/mount.h>
43 #include <linux/btrfs.h>
44 #include <linux/blkdev.h>
45 #include <linux/posix_acl_xattr.h>
48 #include "transaction.h"
49 #include "btrfs_inode.h"
50 #include "print-tree.h"
51 #include "ordered-data.h"
55 #include "compression.h"
57 #include "free-space-cache.h"
58 #include "inode-map.h"
63 struct btrfs_iget_args
{
64 struct btrfs_key
*location
;
65 struct btrfs_root
*root
;
68 static const struct inode_operations btrfs_dir_inode_operations
;
69 static const struct inode_operations btrfs_symlink_inode_operations
;
70 static const struct inode_operations btrfs_dir_ro_inode_operations
;
71 static const struct inode_operations btrfs_special_inode_operations
;
72 static const struct inode_operations btrfs_file_inode_operations
;
73 static const struct address_space_operations btrfs_aops
;
74 static const struct address_space_operations btrfs_symlink_aops
;
75 static const struct file_operations btrfs_dir_file_operations
;
76 static struct extent_io_ops btrfs_extent_io_ops
;
78 static struct kmem_cache
*btrfs_inode_cachep
;
79 static struct kmem_cache
*btrfs_delalloc_work_cachep
;
80 struct kmem_cache
*btrfs_trans_handle_cachep
;
81 struct kmem_cache
*btrfs_transaction_cachep
;
82 struct kmem_cache
*btrfs_path_cachep
;
83 struct kmem_cache
*btrfs_free_space_cachep
;
86 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
87 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
88 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
89 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
90 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
91 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
92 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
93 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
96 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
);
97 static int btrfs_truncate(struct inode
*inode
);
98 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
);
99 static noinline
int cow_file_range(struct inode
*inode
,
100 struct page
*locked_page
,
101 u64 start
, u64 end
, int *page_started
,
102 unsigned long *nr_written
, int unlock
);
103 static struct extent_map
*create_pinned_em(struct inode
*inode
, u64 start
,
104 u64 len
, u64 orig_start
,
105 u64 block_start
, u64 block_len
,
106 u64 orig_block_len
, u64 ram_bytes
,
109 static int btrfs_dirty_inode(struct inode
*inode
);
111 static int btrfs_init_inode_security(struct btrfs_trans_handle
*trans
,
112 struct inode
*inode
, struct inode
*dir
,
113 const struct qstr
*qstr
)
117 err
= btrfs_init_acl(trans
, inode
, dir
);
119 err
= btrfs_xattr_security_init(trans
, inode
, dir
, qstr
);
124 * this does all the hard work for inserting an inline extent into
125 * the btree. The caller should have done a btrfs_drop_extents so that
126 * no overlapping inline items exist in the btree
128 static int insert_inline_extent(struct btrfs_trans_handle
*trans
,
129 struct btrfs_path
*path
, int extent_inserted
,
130 struct btrfs_root
*root
, struct inode
*inode
,
131 u64 start
, size_t size
, size_t compressed_size
,
133 struct page
**compressed_pages
)
135 struct extent_buffer
*leaf
;
136 struct page
*page
= NULL
;
139 struct btrfs_file_extent_item
*ei
;
142 size_t cur_size
= size
;
143 unsigned long offset
;
145 if (compressed_size
&& compressed_pages
)
146 cur_size
= compressed_size
;
148 inode_add_bytes(inode
, size
);
150 if (!extent_inserted
) {
151 struct btrfs_key key
;
154 key
.objectid
= btrfs_ino(inode
);
156 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
158 datasize
= btrfs_file_extent_calc_inline_size(cur_size
);
159 path
->leave_spinning
= 1;
160 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
167 leaf
= path
->nodes
[0];
168 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
169 struct btrfs_file_extent_item
);
170 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
171 btrfs_set_file_extent_type(leaf
, ei
, BTRFS_FILE_EXTENT_INLINE
);
172 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
173 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
174 btrfs_set_file_extent_ram_bytes(leaf
, ei
, size
);
175 ptr
= btrfs_file_extent_inline_start(ei
);
177 if (compress_type
!= BTRFS_COMPRESS_NONE
) {
180 while (compressed_size
> 0) {
181 cpage
= compressed_pages
[i
];
182 cur_size
= min_t(unsigned long, compressed_size
,
185 kaddr
= kmap_atomic(cpage
);
186 write_extent_buffer(leaf
, kaddr
, ptr
, cur_size
);
187 kunmap_atomic(kaddr
);
191 compressed_size
-= cur_size
;
193 btrfs_set_file_extent_compression(leaf
, ei
,
196 page
= find_get_page(inode
->i_mapping
,
197 start
>> PAGE_CACHE_SHIFT
);
198 btrfs_set_file_extent_compression(leaf
, ei
, 0);
199 kaddr
= kmap_atomic(page
);
200 offset
= start
& (PAGE_CACHE_SIZE
- 1);
201 write_extent_buffer(leaf
, kaddr
+ offset
, ptr
, size
);
202 kunmap_atomic(kaddr
);
203 page_cache_release(page
);
205 btrfs_mark_buffer_dirty(leaf
);
206 btrfs_release_path(path
);
209 * we're an inline extent, so nobody can
210 * extend the file past i_size without locking
211 * a page we already have locked.
213 * We must do any isize and inode updates
214 * before we unlock the pages. Otherwise we
215 * could end up racing with unlink.
217 BTRFS_I(inode
)->disk_i_size
= inode
->i_size
;
218 ret
= btrfs_update_inode(trans
, root
, inode
);
227 * conditionally insert an inline extent into the file. This
228 * does the checks required to make sure the data is small enough
229 * to fit as an inline extent.
231 static noinline
int cow_file_range_inline(struct btrfs_root
*root
,
232 struct inode
*inode
, u64 start
,
233 u64 end
, size_t compressed_size
,
235 struct page
**compressed_pages
)
237 struct btrfs_trans_handle
*trans
;
238 u64 isize
= i_size_read(inode
);
239 u64 actual_end
= min(end
+ 1, isize
);
240 u64 inline_len
= actual_end
- start
;
241 u64 aligned_end
= ALIGN(end
, root
->sectorsize
);
242 u64 data_len
= inline_len
;
244 struct btrfs_path
*path
;
245 int extent_inserted
= 0;
246 u32 extent_item_size
;
249 data_len
= compressed_size
;
252 actual_end
>= PAGE_CACHE_SIZE
||
253 data_len
>= BTRFS_MAX_INLINE_DATA_SIZE(root
) ||
255 (actual_end
& (root
->sectorsize
- 1)) == 0) ||
257 data_len
> root
->fs_info
->max_inline
) {
261 path
= btrfs_alloc_path();
265 trans
= btrfs_join_transaction(root
);
267 btrfs_free_path(path
);
268 return PTR_ERR(trans
);
270 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
272 if (compressed_size
&& compressed_pages
)
273 extent_item_size
= btrfs_file_extent_calc_inline_size(
276 extent_item_size
= btrfs_file_extent_calc_inline_size(
279 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
,
280 start
, aligned_end
, NULL
,
281 1, 1, extent_item_size
, &extent_inserted
);
283 btrfs_abort_transaction(trans
, root
, ret
);
287 if (isize
> actual_end
)
288 inline_len
= min_t(u64
, isize
, actual_end
);
289 ret
= insert_inline_extent(trans
, path
, extent_inserted
,
291 inline_len
, compressed_size
,
292 compress_type
, compressed_pages
);
293 if (ret
&& ret
!= -ENOSPC
) {
294 btrfs_abort_transaction(trans
, root
, ret
);
296 } else if (ret
== -ENOSPC
) {
301 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
302 btrfs_delalloc_release_metadata(inode
, end
+ 1 - start
);
303 btrfs_drop_extent_cache(inode
, start
, aligned_end
- 1, 0);
305 btrfs_free_path(path
);
306 btrfs_end_transaction(trans
, root
);
310 struct async_extent
{
315 unsigned long nr_pages
;
317 struct list_head list
;
322 struct btrfs_root
*root
;
323 struct page
*locked_page
;
326 struct list_head extents
;
327 struct btrfs_work work
;
330 static noinline
int add_async_extent(struct async_cow
*cow
,
331 u64 start
, u64 ram_size
,
334 unsigned long nr_pages
,
337 struct async_extent
*async_extent
;
339 async_extent
= kmalloc(sizeof(*async_extent
), GFP_NOFS
);
340 BUG_ON(!async_extent
); /* -ENOMEM */
341 async_extent
->start
= start
;
342 async_extent
->ram_size
= ram_size
;
343 async_extent
->compressed_size
= compressed_size
;
344 async_extent
->pages
= pages
;
345 async_extent
->nr_pages
= nr_pages
;
346 async_extent
->compress_type
= compress_type
;
347 list_add_tail(&async_extent
->list
, &cow
->extents
);
352 * we create compressed extents in two phases. The first
353 * phase compresses a range of pages that have already been
354 * locked (both pages and state bits are locked).
356 * This is done inside an ordered work queue, and the compression
357 * is spread across many cpus. The actual IO submission is step
358 * two, and the ordered work queue takes care of making sure that
359 * happens in the same order things were put onto the queue by
360 * writepages and friends.
362 * If this code finds it can't get good compression, it puts an
363 * entry onto the work queue to write the uncompressed bytes. This
364 * makes sure that both compressed inodes and uncompressed inodes
365 * are written in the same order that the flusher thread sent them
368 static noinline
int compress_file_range(struct inode
*inode
,
369 struct page
*locked_page
,
371 struct async_cow
*async_cow
,
374 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
376 u64 blocksize
= root
->sectorsize
;
378 u64 isize
= i_size_read(inode
);
380 struct page
**pages
= NULL
;
381 unsigned long nr_pages
;
382 unsigned long nr_pages_ret
= 0;
383 unsigned long total_compressed
= 0;
384 unsigned long total_in
= 0;
385 unsigned long max_compressed
= 128 * 1024;
386 unsigned long max_uncompressed
= 128 * 1024;
389 int compress_type
= root
->fs_info
->compress_type
;
392 /* if this is a small write inside eof, kick off a defrag */
393 if ((end
- start
+ 1) < 16 * 1024 &&
394 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
395 btrfs_add_inode_defrag(NULL
, inode
);
398 * skip compression for a small file range(<=blocksize) that
399 * isn't an inline extent, since it dosen't save disk space at all.
401 if ((end
- start
+ 1) <= blocksize
&&
402 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
403 goto cleanup_and_bail_uncompressed
;
405 actual_end
= min_t(u64
, isize
, end
+ 1);
408 nr_pages
= (end
>> PAGE_CACHE_SHIFT
) - (start
>> PAGE_CACHE_SHIFT
) + 1;
409 nr_pages
= min(nr_pages
, (128 * 1024UL) / PAGE_CACHE_SIZE
);
412 * we don't want to send crud past the end of i_size through
413 * compression, that's just a waste of CPU time. So, if the
414 * end of the file is before the start of our current
415 * requested range of bytes, we bail out to the uncompressed
416 * cleanup code that can deal with all of this.
418 * It isn't really the fastest way to fix things, but this is a
419 * very uncommon corner.
421 if (actual_end
<= start
)
422 goto cleanup_and_bail_uncompressed
;
424 total_compressed
= actual_end
- start
;
426 /* we want to make sure that amount of ram required to uncompress
427 * an extent is reasonable, so we limit the total size in ram
428 * of a compressed extent to 128k. This is a crucial number
429 * because it also controls how easily we can spread reads across
430 * cpus for decompression.
432 * We also want to make sure the amount of IO required to do
433 * a random read is reasonably small, so we limit the size of
434 * a compressed extent to 128k.
436 total_compressed
= min(total_compressed
, max_uncompressed
);
437 num_bytes
= ALIGN(end
- start
+ 1, blocksize
);
438 num_bytes
= max(blocksize
, num_bytes
);
443 * we do compression for mount -o compress and when the
444 * inode has not been flagged as nocompress. This flag can
445 * change at any time if we discover bad compression ratios.
447 if (!(BTRFS_I(inode
)->flags
& BTRFS_INODE_NOCOMPRESS
) &&
448 (btrfs_test_opt(root
, COMPRESS
) ||
449 (BTRFS_I(inode
)->force_compress
) ||
450 (BTRFS_I(inode
)->flags
& BTRFS_INODE_COMPRESS
))) {
452 pages
= kzalloc(sizeof(struct page
*) * nr_pages
, GFP_NOFS
);
454 /* just bail out to the uncompressed code */
458 if (BTRFS_I(inode
)->force_compress
)
459 compress_type
= BTRFS_I(inode
)->force_compress
;
462 * we need to call clear_page_dirty_for_io on each
463 * page in the range. Otherwise applications with the file
464 * mmap'd can wander in and change the page contents while
465 * we are compressing them.
467 * If the compression fails for any reason, we set the pages
468 * dirty again later on.
470 extent_range_clear_dirty_for_io(inode
, start
, end
);
472 ret
= btrfs_compress_pages(compress_type
,
473 inode
->i_mapping
, start
,
474 total_compressed
, pages
,
475 nr_pages
, &nr_pages_ret
,
481 unsigned long offset
= total_compressed
&
482 (PAGE_CACHE_SIZE
- 1);
483 struct page
*page
= pages
[nr_pages_ret
- 1];
486 /* zero the tail end of the last page, we might be
487 * sending it down to disk
490 kaddr
= kmap_atomic(page
);
491 memset(kaddr
+ offset
, 0,
492 PAGE_CACHE_SIZE
- offset
);
493 kunmap_atomic(kaddr
);
500 /* lets try to make an inline extent */
501 if (ret
|| total_in
< (actual_end
- start
)) {
502 /* we didn't compress the entire range, try
503 * to make an uncompressed inline extent.
505 ret
= cow_file_range_inline(root
, inode
, start
, end
,
508 /* try making a compressed inline extent */
509 ret
= cow_file_range_inline(root
, inode
, start
, end
,
511 compress_type
, pages
);
514 unsigned long clear_flags
= EXTENT_DELALLOC
|
516 clear_flags
|= (ret
< 0) ? EXTENT_DO_ACCOUNTING
: 0;
519 * inline extent creation worked or returned error,
520 * we don't need to create any more async work items.
521 * Unlock and free up our temp pages.
523 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
,
524 clear_flags
, PAGE_UNLOCK
|
534 * we aren't doing an inline extent round the compressed size
535 * up to a block size boundary so the allocator does sane
538 total_compressed
= ALIGN(total_compressed
, blocksize
);
541 * one last check to make sure the compression is really a
542 * win, compare the page count read with the blocks on disk
544 total_in
= ALIGN(total_in
, PAGE_CACHE_SIZE
);
545 if (total_compressed
>= total_in
) {
548 num_bytes
= total_in
;
551 if (!will_compress
&& pages
) {
553 * the compression code ran but failed to make things smaller,
554 * free any pages it allocated and our page pointer array
556 for (i
= 0; i
< nr_pages_ret
; i
++) {
557 WARN_ON(pages
[i
]->mapping
);
558 page_cache_release(pages
[i
]);
562 total_compressed
= 0;
565 /* flag the file so we don't compress in the future */
566 if (!btrfs_test_opt(root
, FORCE_COMPRESS
) &&
567 !(BTRFS_I(inode
)->force_compress
)) {
568 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
574 /* the async work queues will take care of doing actual
575 * allocation on disk for these compressed pages,
576 * and will submit them to the elevator.
578 add_async_extent(async_cow
, start
, num_bytes
,
579 total_compressed
, pages
, nr_pages_ret
,
582 if (start
+ num_bytes
< end
) {
589 cleanup_and_bail_uncompressed
:
591 * No compression, but we still need to write the pages in
592 * the file we've been given so far. redirty the locked
593 * page if it corresponds to our extent and set things up
594 * for the async work queue to run cow_file_range to do
595 * the normal delalloc dance
597 if (page_offset(locked_page
) >= start
&&
598 page_offset(locked_page
) <= end
) {
599 __set_page_dirty_nobuffers(locked_page
);
600 /* unlocked later on in the async handlers */
603 extent_range_redirty_for_io(inode
, start
, end
);
604 add_async_extent(async_cow
, start
, end
- start
+ 1,
605 0, NULL
, 0, BTRFS_COMPRESS_NONE
);
613 for (i
= 0; i
< nr_pages_ret
; i
++) {
614 WARN_ON(pages
[i
]->mapping
);
615 page_cache_release(pages
[i
]);
623 * phase two of compressed writeback. This is the ordered portion
624 * of the code, which only gets called in the order the work was
625 * queued. We walk all the async extents created by compress_file_range
626 * and send them down to the disk.
628 static noinline
int submit_compressed_extents(struct inode
*inode
,
629 struct async_cow
*async_cow
)
631 struct async_extent
*async_extent
;
633 struct btrfs_key ins
;
634 struct extent_map
*em
;
635 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
636 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
637 struct extent_io_tree
*io_tree
;
640 if (list_empty(&async_cow
->extents
))
644 while (!list_empty(&async_cow
->extents
)) {
645 async_extent
= list_entry(async_cow
->extents
.next
,
646 struct async_extent
, list
);
647 list_del(&async_extent
->list
);
649 io_tree
= &BTRFS_I(inode
)->io_tree
;
652 /* did the compression code fall back to uncompressed IO? */
653 if (!async_extent
->pages
) {
654 int page_started
= 0;
655 unsigned long nr_written
= 0;
657 lock_extent(io_tree
, async_extent
->start
,
658 async_extent
->start
+
659 async_extent
->ram_size
- 1);
661 /* allocate blocks */
662 ret
= cow_file_range(inode
, async_cow
->locked_page
,
664 async_extent
->start
+
665 async_extent
->ram_size
- 1,
666 &page_started
, &nr_written
, 0);
671 * if page_started, cow_file_range inserted an
672 * inline extent and took care of all the unlocking
673 * and IO for us. Otherwise, we need to submit
674 * all those pages down to the drive.
676 if (!page_started
&& !ret
)
677 extent_write_locked_range(io_tree
,
678 inode
, async_extent
->start
,
679 async_extent
->start
+
680 async_extent
->ram_size
- 1,
684 unlock_page(async_cow
->locked_page
);
690 lock_extent(io_tree
, async_extent
->start
,
691 async_extent
->start
+ async_extent
->ram_size
- 1);
693 ret
= btrfs_reserve_extent(root
,
694 async_extent
->compressed_size
,
695 async_extent
->compressed_size
,
696 0, alloc_hint
, &ins
, 1, 1);
700 for (i
= 0; i
< async_extent
->nr_pages
; i
++) {
701 WARN_ON(async_extent
->pages
[i
]->mapping
);
702 page_cache_release(async_extent
->pages
[i
]);
704 kfree(async_extent
->pages
);
705 async_extent
->nr_pages
= 0;
706 async_extent
->pages
= NULL
;
708 if (ret
== -ENOSPC
) {
709 unlock_extent(io_tree
, async_extent
->start
,
710 async_extent
->start
+
711 async_extent
->ram_size
- 1);
718 * here we're doing allocation and writeback of the
721 btrfs_drop_extent_cache(inode
, async_extent
->start
,
722 async_extent
->start
+
723 async_extent
->ram_size
- 1, 0);
725 em
= alloc_extent_map();
728 goto out_free_reserve
;
730 em
->start
= async_extent
->start
;
731 em
->len
= async_extent
->ram_size
;
732 em
->orig_start
= em
->start
;
733 em
->mod_start
= em
->start
;
734 em
->mod_len
= em
->len
;
736 em
->block_start
= ins
.objectid
;
737 em
->block_len
= ins
.offset
;
738 em
->orig_block_len
= ins
.offset
;
739 em
->ram_bytes
= async_extent
->ram_size
;
740 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
741 em
->compress_type
= async_extent
->compress_type
;
742 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
743 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
747 write_lock(&em_tree
->lock
);
748 ret
= add_extent_mapping(em_tree
, em
, 1);
749 write_unlock(&em_tree
->lock
);
750 if (ret
!= -EEXIST
) {
754 btrfs_drop_extent_cache(inode
, async_extent
->start
,
755 async_extent
->start
+
756 async_extent
->ram_size
- 1, 0);
760 goto out_free_reserve
;
762 ret
= btrfs_add_ordered_extent_compress(inode
,
765 async_extent
->ram_size
,
767 BTRFS_ORDERED_COMPRESSED
,
768 async_extent
->compress_type
);
770 goto out_free_reserve
;
773 * clear dirty, set writeback and unlock the pages.
775 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
776 async_extent
->start
+
777 async_extent
->ram_size
- 1,
778 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
,
779 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
781 ret
= btrfs_submit_compressed_write(inode
,
783 async_extent
->ram_size
,
785 ins
.offset
, async_extent
->pages
,
786 async_extent
->nr_pages
);
787 alloc_hint
= ins
.objectid
+ ins
.offset
;
797 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
799 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
800 async_extent
->start
+
801 async_extent
->ram_size
- 1,
802 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
|
803 EXTENT_DEFRAG
| EXTENT_DO_ACCOUNTING
,
804 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
805 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
);
810 static u64
get_extent_allocation_hint(struct inode
*inode
, u64 start
,
813 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
814 struct extent_map
*em
;
817 read_lock(&em_tree
->lock
);
818 em
= search_extent_mapping(em_tree
, start
, num_bytes
);
821 * if block start isn't an actual block number then find the
822 * first block in this inode and use that as a hint. If that
823 * block is also bogus then just don't worry about it.
825 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
827 em
= search_extent_mapping(em_tree
, 0, 0);
828 if (em
&& em
->block_start
< EXTENT_MAP_LAST_BYTE
)
829 alloc_hint
= em
->block_start
;
833 alloc_hint
= em
->block_start
;
837 read_unlock(&em_tree
->lock
);
843 * when extent_io.c finds a delayed allocation range in the file,
844 * the call backs end up in this code. The basic idea is to
845 * allocate extents on disk for the range, and create ordered data structs
846 * in ram to track those extents.
848 * locked_page is the page that writepage had locked already. We use
849 * it to make sure we don't do extra locks or unlocks.
851 * *page_started is set to one if we unlock locked_page and do everything
852 * required to start IO on it. It may be clean and already done with
855 static noinline
int cow_file_range(struct inode
*inode
,
856 struct page
*locked_page
,
857 u64 start
, u64 end
, int *page_started
,
858 unsigned long *nr_written
,
861 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
864 unsigned long ram_size
;
867 u64 blocksize
= root
->sectorsize
;
868 struct btrfs_key ins
;
869 struct extent_map
*em
;
870 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
873 if (btrfs_is_free_space_inode(inode
)) {
879 num_bytes
= ALIGN(end
- start
+ 1, blocksize
);
880 num_bytes
= max(blocksize
, num_bytes
);
881 disk_num_bytes
= num_bytes
;
883 /* if this is a small write inside eof, kick off defrag */
884 if (num_bytes
< 64 * 1024 &&
885 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
886 btrfs_add_inode_defrag(NULL
, inode
);
889 /* lets try to make an inline extent */
890 ret
= cow_file_range_inline(root
, inode
, start
, end
, 0, 0,
893 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
,
894 EXTENT_LOCKED
| EXTENT_DELALLOC
|
895 EXTENT_DEFRAG
, PAGE_UNLOCK
|
896 PAGE_CLEAR_DIRTY
| PAGE_SET_WRITEBACK
|
899 *nr_written
= *nr_written
+
900 (end
- start
+ PAGE_CACHE_SIZE
) / PAGE_CACHE_SIZE
;
903 } else if (ret
< 0) {
908 BUG_ON(disk_num_bytes
>
909 btrfs_super_total_bytes(root
->fs_info
->super_copy
));
911 alloc_hint
= get_extent_allocation_hint(inode
, start
, num_bytes
);
912 btrfs_drop_extent_cache(inode
, start
, start
+ num_bytes
- 1, 0);
914 while (disk_num_bytes
> 0) {
917 cur_alloc_size
= disk_num_bytes
;
918 ret
= btrfs_reserve_extent(root
, cur_alloc_size
,
919 root
->sectorsize
, 0, alloc_hint
,
924 em
= alloc_extent_map();
930 em
->orig_start
= em
->start
;
931 ram_size
= ins
.offset
;
932 em
->len
= ins
.offset
;
933 em
->mod_start
= em
->start
;
934 em
->mod_len
= em
->len
;
936 em
->block_start
= ins
.objectid
;
937 em
->block_len
= ins
.offset
;
938 em
->orig_block_len
= ins
.offset
;
939 em
->ram_bytes
= ram_size
;
940 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
941 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
945 write_lock(&em_tree
->lock
);
946 ret
= add_extent_mapping(em_tree
, em
, 1);
947 write_unlock(&em_tree
->lock
);
948 if (ret
!= -EEXIST
) {
952 btrfs_drop_extent_cache(inode
, start
,
953 start
+ ram_size
- 1, 0);
958 cur_alloc_size
= ins
.offset
;
959 ret
= btrfs_add_ordered_extent(inode
, start
, ins
.objectid
,
960 ram_size
, cur_alloc_size
, 0);
964 if (root
->root_key
.objectid
==
965 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
966 ret
= btrfs_reloc_clone_csums(inode
, start
,
972 if (disk_num_bytes
< cur_alloc_size
)
975 /* we're not doing compressed IO, don't unlock the first
976 * page (which the caller expects to stay locked), don't
977 * clear any dirty bits and don't set any writeback bits
979 * Do set the Private2 bit so we know this page was properly
980 * setup for writepage
982 op
= unlock
? PAGE_UNLOCK
: 0;
983 op
|= PAGE_SET_PRIVATE2
;
985 extent_clear_unlock_delalloc(inode
, start
,
986 start
+ ram_size
- 1, locked_page
,
987 EXTENT_LOCKED
| EXTENT_DELALLOC
,
989 disk_num_bytes
-= cur_alloc_size
;
990 num_bytes
-= cur_alloc_size
;
991 alloc_hint
= ins
.objectid
+ ins
.offset
;
992 start
+= cur_alloc_size
;
998 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
1000 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1001 EXTENT_LOCKED
| EXTENT_DO_ACCOUNTING
|
1002 EXTENT_DELALLOC
| EXTENT_DEFRAG
,
1003 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
1004 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
);
1009 * work queue call back to started compression on a file and pages
1011 static noinline
void async_cow_start(struct btrfs_work
*work
)
1013 struct async_cow
*async_cow
;
1015 async_cow
= container_of(work
, struct async_cow
, work
);
1017 compress_file_range(async_cow
->inode
, async_cow
->locked_page
,
1018 async_cow
->start
, async_cow
->end
, async_cow
,
1020 if (num_added
== 0) {
1021 btrfs_add_delayed_iput(async_cow
->inode
);
1022 async_cow
->inode
= NULL
;
1027 * work queue call back to submit previously compressed pages
1029 static noinline
void async_cow_submit(struct btrfs_work
*work
)
1031 struct async_cow
*async_cow
;
1032 struct btrfs_root
*root
;
1033 unsigned long nr_pages
;
1035 async_cow
= container_of(work
, struct async_cow
, work
);
1037 root
= async_cow
->root
;
1038 nr_pages
= (async_cow
->end
- async_cow
->start
+ PAGE_CACHE_SIZE
) >>
1041 if (atomic_sub_return(nr_pages
, &root
->fs_info
->async_delalloc_pages
) <
1043 waitqueue_active(&root
->fs_info
->async_submit_wait
))
1044 wake_up(&root
->fs_info
->async_submit_wait
);
1046 if (async_cow
->inode
)
1047 submit_compressed_extents(async_cow
->inode
, async_cow
);
1050 static noinline
void async_cow_free(struct btrfs_work
*work
)
1052 struct async_cow
*async_cow
;
1053 async_cow
= container_of(work
, struct async_cow
, work
);
1054 if (async_cow
->inode
)
1055 btrfs_add_delayed_iput(async_cow
->inode
);
1059 static int cow_file_range_async(struct inode
*inode
, struct page
*locked_page
,
1060 u64 start
, u64 end
, int *page_started
,
1061 unsigned long *nr_written
)
1063 struct async_cow
*async_cow
;
1064 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1065 unsigned long nr_pages
;
1067 int limit
= 10 * 1024 * 1024;
1069 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, start
, end
, EXTENT_LOCKED
,
1070 1, 0, NULL
, GFP_NOFS
);
1071 while (start
< end
) {
1072 async_cow
= kmalloc(sizeof(*async_cow
), GFP_NOFS
);
1073 BUG_ON(!async_cow
); /* -ENOMEM */
1074 async_cow
->inode
= igrab(inode
);
1075 async_cow
->root
= root
;
1076 async_cow
->locked_page
= locked_page
;
1077 async_cow
->start
= start
;
1079 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NOCOMPRESS
)
1082 cur_end
= min(end
, start
+ 512 * 1024 - 1);
1084 async_cow
->end
= cur_end
;
1085 INIT_LIST_HEAD(&async_cow
->extents
);
1087 btrfs_init_work(&async_cow
->work
, async_cow_start
,
1088 async_cow_submit
, async_cow_free
);
1090 nr_pages
= (cur_end
- start
+ PAGE_CACHE_SIZE
) >>
1092 atomic_add(nr_pages
, &root
->fs_info
->async_delalloc_pages
);
1094 btrfs_queue_work(root
->fs_info
->delalloc_workers
,
1097 if (atomic_read(&root
->fs_info
->async_delalloc_pages
) > limit
) {
1098 wait_event(root
->fs_info
->async_submit_wait
,
1099 (atomic_read(&root
->fs_info
->async_delalloc_pages
) <
1103 while (atomic_read(&root
->fs_info
->async_submit_draining
) &&
1104 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1105 wait_event(root
->fs_info
->async_submit_wait
,
1106 (atomic_read(&root
->fs_info
->async_delalloc_pages
) ==
1110 *nr_written
+= nr_pages
;
1111 start
= cur_end
+ 1;
1117 static noinline
int csum_exist_in_range(struct btrfs_root
*root
,
1118 u64 bytenr
, u64 num_bytes
)
1121 struct btrfs_ordered_sum
*sums
;
1124 ret
= btrfs_lookup_csums_range(root
->fs_info
->csum_root
, bytenr
,
1125 bytenr
+ num_bytes
- 1, &list
, 0);
1126 if (ret
== 0 && list_empty(&list
))
1129 while (!list_empty(&list
)) {
1130 sums
= list_entry(list
.next
, struct btrfs_ordered_sum
, list
);
1131 list_del(&sums
->list
);
1138 * when nowcow writeback call back. This checks for snapshots or COW copies
1139 * of the extents that exist in the file, and COWs the file as required.
1141 * If no cow copies or snapshots exist, we write directly to the existing
1144 static noinline
int run_delalloc_nocow(struct inode
*inode
,
1145 struct page
*locked_page
,
1146 u64 start
, u64 end
, int *page_started
, int force
,
1147 unsigned long *nr_written
)
1149 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1150 struct btrfs_trans_handle
*trans
;
1151 struct extent_buffer
*leaf
;
1152 struct btrfs_path
*path
;
1153 struct btrfs_file_extent_item
*fi
;
1154 struct btrfs_key found_key
;
1169 u64 ino
= btrfs_ino(inode
);
1171 path
= btrfs_alloc_path();
1173 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1174 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1175 EXTENT_DO_ACCOUNTING
|
1176 EXTENT_DEFRAG
, PAGE_UNLOCK
|
1178 PAGE_SET_WRITEBACK
|
1179 PAGE_END_WRITEBACK
);
1183 nolock
= btrfs_is_free_space_inode(inode
);
1186 trans
= btrfs_join_transaction_nolock(root
);
1188 trans
= btrfs_join_transaction(root
);
1190 if (IS_ERR(trans
)) {
1191 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1192 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1193 EXTENT_DO_ACCOUNTING
|
1194 EXTENT_DEFRAG
, PAGE_UNLOCK
|
1196 PAGE_SET_WRITEBACK
|
1197 PAGE_END_WRITEBACK
);
1198 btrfs_free_path(path
);
1199 return PTR_ERR(trans
);
1202 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
1204 cow_start
= (u64
)-1;
1207 ret
= btrfs_lookup_file_extent(trans
, root
, path
, ino
,
1211 if (ret
> 0 && path
->slots
[0] > 0 && check_prev
) {
1212 leaf
= path
->nodes
[0];
1213 btrfs_item_key_to_cpu(leaf
, &found_key
,
1214 path
->slots
[0] - 1);
1215 if (found_key
.objectid
== ino
&&
1216 found_key
.type
== BTRFS_EXTENT_DATA_KEY
)
1221 leaf
= path
->nodes
[0];
1222 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1223 ret
= btrfs_next_leaf(root
, path
);
1228 leaf
= path
->nodes
[0];
1234 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1236 if (found_key
.objectid
> ino
||
1237 found_key
.type
> BTRFS_EXTENT_DATA_KEY
||
1238 found_key
.offset
> end
)
1241 if (found_key
.offset
> cur_offset
) {
1242 extent_end
= found_key
.offset
;
1247 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1248 struct btrfs_file_extent_item
);
1249 extent_type
= btrfs_file_extent_type(leaf
, fi
);
1251 ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
1252 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
1253 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1254 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
1255 extent_offset
= btrfs_file_extent_offset(leaf
, fi
);
1256 extent_end
= found_key
.offset
+
1257 btrfs_file_extent_num_bytes(leaf
, fi
);
1259 btrfs_file_extent_disk_num_bytes(leaf
, fi
);
1260 if (extent_end
<= start
) {
1264 if (disk_bytenr
== 0)
1266 if (btrfs_file_extent_compression(leaf
, fi
) ||
1267 btrfs_file_extent_encryption(leaf
, fi
) ||
1268 btrfs_file_extent_other_encoding(leaf
, fi
))
1270 if (extent_type
== BTRFS_FILE_EXTENT_REG
&& !force
)
1272 if (btrfs_extent_readonly(root
, disk_bytenr
))
1274 if (btrfs_cross_ref_exist(trans
, root
, ino
,
1276 extent_offset
, disk_bytenr
))
1278 disk_bytenr
+= extent_offset
;
1279 disk_bytenr
+= cur_offset
- found_key
.offset
;
1280 num_bytes
= min(end
+ 1, extent_end
) - cur_offset
;
1282 * if there are pending snapshots for this root,
1283 * we fall into common COW way.
1286 err
= btrfs_start_nocow_write(root
);
1291 * force cow if csum exists in the range.
1292 * this ensure that csum for a given extent are
1293 * either valid or do not exist.
1295 if (csum_exist_in_range(root
, disk_bytenr
, num_bytes
))
1298 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1299 extent_end
= found_key
.offset
+
1300 btrfs_file_extent_inline_len(leaf
,
1301 path
->slots
[0], fi
);
1302 extent_end
= ALIGN(extent_end
, root
->sectorsize
);
1307 if (extent_end
<= start
) {
1309 if (!nolock
&& nocow
)
1310 btrfs_end_nocow_write(root
);
1314 if (cow_start
== (u64
)-1)
1315 cow_start
= cur_offset
;
1316 cur_offset
= extent_end
;
1317 if (cur_offset
> end
)
1323 btrfs_release_path(path
);
1324 if (cow_start
!= (u64
)-1) {
1325 ret
= cow_file_range(inode
, locked_page
,
1326 cow_start
, found_key
.offset
- 1,
1327 page_started
, nr_written
, 1);
1329 if (!nolock
&& nocow
)
1330 btrfs_end_nocow_write(root
);
1333 cow_start
= (u64
)-1;
1336 if (extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1337 struct extent_map
*em
;
1338 struct extent_map_tree
*em_tree
;
1339 em_tree
= &BTRFS_I(inode
)->extent_tree
;
1340 em
= alloc_extent_map();
1341 BUG_ON(!em
); /* -ENOMEM */
1342 em
->start
= cur_offset
;
1343 em
->orig_start
= found_key
.offset
- extent_offset
;
1344 em
->len
= num_bytes
;
1345 em
->block_len
= num_bytes
;
1346 em
->block_start
= disk_bytenr
;
1347 em
->orig_block_len
= disk_num_bytes
;
1348 em
->ram_bytes
= ram_bytes
;
1349 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
1350 em
->mod_start
= em
->start
;
1351 em
->mod_len
= em
->len
;
1352 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
1353 set_bit(EXTENT_FLAG_FILLING
, &em
->flags
);
1354 em
->generation
= -1;
1356 write_lock(&em_tree
->lock
);
1357 ret
= add_extent_mapping(em_tree
, em
, 1);
1358 write_unlock(&em_tree
->lock
);
1359 if (ret
!= -EEXIST
) {
1360 free_extent_map(em
);
1363 btrfs_drop_extent_cache(inode
, em
->start
,
1364 em
->start
+ em
->len
- 1, 0);
1366 type
= BTRFS_ORDERED_PREALLOC
;
1368 type
= BTRFS_ORDERED_NOCOW
;
1371 ret
= btrfs_add_ordered_extent(inode
, cur_offset
, disk_bytenr
,
1372 num_bytes
, num_bytes
, type
);
1373 BUG_ON(ret
); /* -ENOMEM */
1375 if (root
->root_key
.objectid
==
1376 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
1377 ret
= btrfs_reloc_clone_csums(inode
, cur_offset
,
1380 if (!nolock
&& nocow
)
1381 btrfs_end_nocow_write(root
);
1386 extent_clear_unlock_delalloc(inode
, cur_offset
,
1387 cur_offset
+ num_bytes
- 1,
1388 locked_page
, EXTENT_LOCKED
|
1389 EXTENT_DELALLOC
, PAGE_UNLOCK
|
1391 if (!nolock
&& nocow
)
1392 btrfs_end_nocow_write(root
);
1393 cur_offset
= extent_end
;
1394 if (cur_offset
> end
)
1397 btrfs_release_path(path
);
1399 if (cur_offset
<= end
&& cow_start
== (u64
)-1) {
1400 cow_start
= cur_offset
;
1404 if (cow_start
!= (u64
)-1) {
1405 ret
= cow_file_range(inode
, locked_page
, cow_start
, end
,
1406 page_started
, nr_written
, 1);
1412 err
= btrfs_end_transaction(trans
, root
);
1416 if (ret
&& cur_offset
< end
)
1417 extent_clear_unlock_delalloc(inode
, cur_offset
, end
,
1418 locked_page
, EXTENT_LOCKED
|
1419 EXTENT_DELALLOC
| EXTENT_DEFRAG
|
1420 EXTENT_DO_ACCOUNTING
, PAGE_UNLOCK
|
1422 PAGE_SET_WRITEBACK
|
1423 PAGE_END_WRITEBACK
);
1424 btrfs_free_path(path
);
1429 * extent_io.c call back to do delayed allocation processing
1431 static int run_delalloc_range(struct inode
*inode
, struct page
*locked_page
,
1432 u64 start
, u64 end
, int *page_started
,
1433 unsigned long *nr_written
)
1436 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1438 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
) {
1439 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1440 page_started
, 1, nr_written
);
1441 } else if (BTRFS_I(inode
)->flags
& BTRFS_INODE_PREALLOC
) {
1442 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1443 page_started
, 0, nr_written
);
1444 } else if (!btrfs_test_opt(root
, COMPRESS
) &&
1445 !(BTRFS_I(inode
)->force_compress
) &&
1446 !(BTRFS_I(inode
)->flags
& BTRFS_INODE_COMPRESS
)) {
1447 ret
= cow_file_range(inode
, locked_page
, start
, end
,
1448 page_started
, nr_written
, 1);
1450 set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1451 &BTRFS_I(inode
)->runtime_flags
);
1452 ret
= cow_file_range_async(inode
, locked_page
, start
, end
,
1453 page_started
, nr_written
);
1458 static void btrfs_split_extent_hook(struct inode
*inode
,
1459 struct extent_state
*orig
, u64 split
)
1461 /* not delalloc, ignore it */
1462 if (!(orig
->state
& EXTENT_DELALLOC
))
1465 spin_lock(&BTRFS_I(inode
)->lock
);
1466 BTRFS_I(inode
)->outstanding_extents
++;
1467 spin_unlock(&BTRFS_I(inode
)->lock
);
1471 * extent_io.c merge_extent_hook, used to track merged delayed allocation
1472 * extents so we can keep track of new extents that are just merged onto old
1473 * extents, such as when we are doing sequential writes, so we can properly
1474 * account for the metadata space we'll need.
1476 static void btrfs_merge_extent_hook(struct inode
*inode
,
1477 struct extent_state
*new,
1478 struct extent_state
*other
)
1480 /* not delalloc, ignore it */
1481 if (!(other
->state
& EXTENT_DELALLOC
))
1484 spin_lock(&BTRFS_I(inode
)->lock
);
1485 BTRFS_I(inode
)->outstanding_extents
--;
1486 spin_unlock(&BTRFS_I(inode
)->lock
);
1489 static void btrfs_add_delalloc_inodes(struct btrfs_root
*root
,
1490 struct inode
*inode
)
1492 spin_lock(&root
->delalloc_lock
);
1493 if (list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1494 list_add_tail(&BTRFS_I(inode
)->delalloc_inodes
,
1495 &root
->delalloc_inodes
);
1496 set_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1497 &BTRFS_I(inode
)->runtime_flags
);
1498 root
->nr_delalloc_inodes
++;
1499 if (root
->nr_delalloc_inodes
== 1) {
1500 spin_lock(&root
->fs_info
->delalloc_root_lock
);
1501 BUG_ON(!list_empty(&root
->delalloc_root
));
1502 list_add_tail(&root
->delalloc_root
,
1503 &root
->fs_info
->delalloc_roots
);
1504 spin_unlock(&root
->fs_info
->delalloc_root_lock
);
1507 spin_unlock(&root
->delalloc_lock
);
1510 static void btrfs_del_delalloc_inode(struct btrfs_root
*root
,
1511 struct inode
*inode
)
1513 spin_lock(&root
->delalloc_lock
);
1514 if (!list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1515 list_del_init(&BTRFS_I(inode
)->delalloc_inodes
);
1516 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1517 &BTRFS_I(inode
)->runtime_flags
);
1518 root
->nr_delalloc_inodes
--;
1519 if (!root
->nr_delalloc_inodes
) {
1520 spin_lock(&root
->fs_info
->delalloc_root_lock
);
1521 BUG_ON(list_empty(&root
->delalloc_root
));
1522 list_del_init(&root
->delalloc_root
);
1523 spin_unlock(&root
->fs_info
->delalloc_root_lock
);
1526 spin_unlock(&root
->delalloc_lock
);
1530 * extent_io.c set_bit_hook, used to track delayed allocation
1531 * bytes in this file, and to maintain the list of inodes that
1532 * have pending delalloc work to be done.
1534 static void btrfs_set_bit_hook(struct inode
*inode
,
1535 struct extent_state
*state
, unsigned long *bits
)
1539 * set_bit and clear bit hooks normally require _irqsave/restore
1540 * but in this case, we are only testing for the DELALLOC
1541 * bit, which is only set or cleared with irqs on
1543 if (!(state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
1544 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1545 u64 len
= state
->end
+ 1 - state
->start
;
1546 bool do_list
= !btrfs_is_free_space_inode(inode
);
1548 if (*bits
& EXTENT_FIRST_DELALLOC
) {
1549 *bits
&= ~EXTENT_FIRST_DELALLOC
;
1551 spin_lock(&BTRFS_I(inode
)->lock
);
1552 BTRFS_I(inode
)->outstanding_extents
++;
1553 spin_unlock(&BTRFS_I(inode
)->lock
);
1556 __percpu_counter_add(&root
->fs_info
->delalloc_bytes
, len
,
1557 root
->fs_info
->delalloc_batch
);
1558 spin_lock(&BTRFS_I(inode
)->lock
);
1559 BTRFS_I(inode
)->delalloc_bytes
+= len
;
1560 if (do_list
&& !test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1561 &BTRFS_I(inode
)->runtime_flags
))
1562 btrfs_add_delalloc_inodes(root
, inode
);
1563 spin_unlock(&BTRFS_I(inode
)->lock
);
1568 * extent_io.c clear_bit_hook, see set_bit_hook for why
1570 static void btrfs_clear_bit_hook(struct inode
*inode
,
1571 struct extent_state
*state
,
1572 unsigned long *bits
)
1575 * set_bit and clear bit hooks normally require _irqsave/restore
1576 * but in this case, we are only testing for the DELALLOC
1577 * bit, which is only set or cleared with irqs on
1579 if ((state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
1580 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1581 u64 len
= state
->end
+ 1 - state
->start
;
1582 bool do_list
= !btrfs_is_free_space_inode(inode
);
1584 if (*bits
& EXTENT_FIRST_DELALLOC
) {
1585 *bits
&= ~EXTENT_FIRST_DELALLOC
;
1586 } else if (!(*bits
& EXTENT_DO_ACCOUNTING
)) {
1587 spin_lock(&BTRFS_I(inode
)->lock
);
1588 BTRFS_I(inode
)->outstanding_extents
--;
1589 spin_unlock(&BTRFS_I(inode
)->lock
);
1593 * We don't reserve metadata space for space cache inodes so we
1594 * don't need to call dellalloc_release_metadata if there is an
1597 if (*bits
& EXTENT_DO_ACCOUNTING
&&
1598 root
!= root
->fs_info
->tree_root
)
1599 btrfs_delalloc_release_metadata(inode
, len
);
1601 if (root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
1602 && do_list
&& !(state
->state
& EXTENT_NORESERVE
))
1603 btrfs_free_reserved_data_space(inode
, len
);
1605 __percpu_counter_add(&root
->fs_info
->delalloc_bytes
, -len
,
1606 root
->fs_info
->delalloc_batch
);
1607 spin_lock(&BTRFS_I(inode
)->lock
);
1608 BTRFS_I(inode
)->delalloc_bytes
-= len
;
1609 if (do_list
&& BTRFS_I(inode
)->delalloc_bytes
== 0 &&
1610 test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1611 &BTRFS_I(inode
)->runtime_flags
))
1612 btrfs_del_delalloc_inode(root
, inode
);
1613 spin_unlock(&BTRFS_I(inode
)->lock
);
1618 * extent_io.c merge_bio_hook, this must check the chunk tree to make sure
1619 * we don't create bios that span stripes or chunks
1621 int btrfs_merge_bio_hook(int rw
, struct page
*page
, unsigned long offset
,
1622 size_t size
, struct bio
*bio
,
1623 unsigned long bio_flags
)
1625 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
1626 u64 logical
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
1631 if (bio_flags
& EXTENT_BIO_COMPRESSED
)
1634 length
= bio
->bi_iter
.bi_size
;
1635 map_length
= length
;
1636 ret
= btrfs_map_block(root
->fs_info
, rw
, logical
,
1637 &map_length
, NULL
, 0);
1638 /* Will always return 0 with map_multi == NULL */
1640 if (map_length
< length
+ size
)
1646 * in order to insert checksums into the metadata in large chunks,
1647 * we wait until bio submission time. All the pages in the bio are
1648 * checksummed and sums are attached onto the ordered extent record.
1650 * At IO completion time the cums attached on the ordered extent record
1651 * are inserted into the btree
1653 static int __btrfs_submit_bio_start(struct inode
*inode
, int rw
,
1654 struct bio
*bio
, int mirror_num
,
1655 unsigned long bio_flags
,
1658 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1661 ret
= btrfs_csum_one_bio(root
, inode
, bio
, 0, 0);
1662 BUG_ON(ret
); /* -ENOMEM */
1667 * in order to insert checksums into the metadata in large chunks,
1668 * we wait until bio submission time. All the pages in the bio are
1669 * checksummed and sums are attached onto the ordered extent record.
1671 * At IO completion time the cums attached on the ordered extent record
1672 * are inserted into the btree
1674 static int __btrfs_submit_bio_done(struct inode
*inode
, int rw
, struct bio
*bio
,
1675 int mirror_num
, unsigned long bio_flags
,
1678 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1681 ret
= btrfs_map_bio(root
, rw
, bio
, mirror_num
, 1);
1683 bio_endio(bio
, ret
);
1688 * extent_io.c submission hook. This does the right thing for csum calculation
1689 * on write, or reading the csums from the tree before a read
1691 static int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
1692 int mirror_num
, unsigned long bio_flags
,
1695 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1699 int async
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
1701 skip_sum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
1703 if (btrfs_is_free_space_inode(inode
))
1706 if (!(rw
& REQ_WRITE
)) {
1707 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, metadata
);
1711 if (bio_flags
& EXTENT_BIO_COMPRESSED
) {
1712 ret
= btrfs_submit_compressed_read(inode
, bio
,
1716 } else if (!skip_sum
) {
1717 ret
= btrfs_lookup_bio_sums(root
, inode
, bio
, NULL
);
1722 } else if (async
&& !skip_sum
) {
1723 /* csum items have already been cloned */
1724 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
1726 /* we're doing a write, do the async checksumming */
1727 ret
= btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
1728 inode
, rw
, bio
, mirror_num
,
1729 bio_flags
, bio_offset
,
1730 __btrfs_submit_bio_start
,
1731 __btrfs_submit_bio_done
);
1733 } else if (!skip_sum
) {
1734 ret
= btrfs_csum_one_bio(root
, inode
, bio
, 0, 0);
1740 ret
= btrfs_map_bio(root
, rw
, bio
, mirror_num
, 0);
1744 bio_endio(bio
, ret
);
1749 * given a list of ordered sums record them in the inode. This happens
1750 * at IO completion time based on sums calculated at bio submission time.
1752 static noinline
int add_pending_csums(struct btrfs_trans_handle
*trans
,
1753 struct inode
*inode
, u64 file_offset
,
1754 struct list_head
*list
)
1756 struct btrfs_ordered_sum
*sum
;
1758 list_for_each_entry(sum
, list
, list
) {
1759 trans
->adding_csums
= 1;
1760 btrfs_csum_file_blocks(trans
,
1761 BTRFS_I(inode
)->root
->fs_info
->csum_root
, sum
);
1762 trans
->adding_csums
= 0;
1767 int btrfs_set_extent_delalloc(struct inode
*inode
, u64 start
, u64 end
,
1768 struct extent_state
**cached_state
)
1770 WARN_ON((end
& (PAGE_CACHE_SIZE
- 1)) == 0);
1771 return set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, start
, end
,
1772 cached_state
, GFP_NOFS
);
1775 /* see btrfs_writepage_start_hook for details on why this is required */
1776 struct btrfs_writepage_fixup
{
1778 struct btrfs_work work
;
1781 static void btrfs_writepage_fixup_worker(struct btrfs_work
*work
)
1783 struct btrfs_writepage_fixup
*fixup
;
1784 struct btrfs_ordered_extent
*ordered
;
1785 struct extent_state
*cached_state
= NULL
;
1787 struct inode
*inode
;
1792 fixup
= container_of(work
, struct btrfs_writepage_fixup
, work
);
1796 if (!page
->mapping
|| !PageDirty(page
) || !PageChecked(page
)) {
1797 ClearPageChecked(page
);
1801 inode
= page
->mapping
->host
;
1802 page_start
= page_offset(page
);
1803 page_end
= page_offset(page
) + PAGE_CACHE_SIZE
- 1;
1805 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, 0,
1808 /* already ordered? We're done */
1809 if (PagePrivate2(page
))
1812 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
1814 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, page_start
,
1815 page_end
, &cached_state
, GFP_NOFS
);
1817 btrfs_start_ordered_extent(inode
, ordered
, 1);
1818 btrfs_put_ordered_extent(ordered
);
1822 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
1824 mapping_set_error(page
->mapping
, ret
);
1825 end_extent_writepage(page
, ret
, page_start
, page_end
);
1826 ClearPageChecked(page
);
1830 btrfs_set_extent_delalloc(inode
, page_start
, page_end
, &cached_state
);
1831 ClearPageChecked(page
);
1832 set_page_dirty(page
);
1834 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
1835 &cached_state
, GFP_NOFS
);
1838 page_cache_release(page
);
1843 * There are a few paths in the higher layers of the kernel that directly
1844 * set the page dirty bit without asking the filesystem if it is a
1845 * good idea. This causes problems because we want to make sure COW
1846 * properly happens and the data=ordered rules are followed.
1848 * In our case any range that doesn't have the ORDERED bit set
1849 * hasn't been properly setup for IO. We kick off an async process
1850 * to fix it up. The async helper will wait for ordered extents, set
1851 * the delalloc bit and make it safe to write the page.
1853 static int btrfs_writepage_start_hook(struct page
*page
, u64 start
, u64 end
)
1855 struct inode
*inode
= page
->mapping
->host
;
1856 struct btrfs_writepage_fixup
*fixup
;
1857 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1859 /* this page is properly in the ordered list */
1860 if (TestClearPagePrivate2(page
))
1863 if (PageChecked(page
))
1866 fixup
= kzalloc(sizeof(*fixup
), GFP_NOFS
);
1870 SetPageChecked(page
);
1871 page_cache_get(page
);
1872 btrfs_init_work(&fixup
->work
, btrfs_writepage_fixup_worker
, NULL
, NULL
);
1874 btrfs_queue_work(root
->fs_info
->fixup_workers
, &fixup
->work
);
1878 static int insert_reserved_file_extent(struct btrfs_trans_handle
*trans
,
1879 struct inode
*inode
, u64 file_pos
,
1880 u64 disk_bytenr
, u64 disk_num_bytes
,
1881 u64 num_bytes
, u64 ram_bytes
,
1882 u8 compression
, u8 encryption
,
1883 u16 other_encoding
, int extent_type
)
1885 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1886 struct btrfs_file_extent_item
*fi
;
1887 struct btrfs_path
*path
;
1888 struct extent_buffer
*leaf
;
1889 struct btrfs_key ins
;
1890 int extent_inserted
= 0;
1893 path
= btrfs_alloc_path();
1898 * we may be replacing one extent in the tree with another.
1899 * The new extent is pinned in the extent map, and we don't want
1900 * to drop it from the cache until it is completely in the btree.
1902 * So, tell btrfs_drop_extents to leave this extent in the cache.
1903 * the caller is expected to unpin it and allow it to be merged
1906 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
, file_pos
,
1907 file_pos
+ num_bytes
, NULL
, 0,
1908 1, sizeof(*fi
), &extent_inserted
);
1912 if (!extent_inserted
) {
1913 ins
.objectid
= btrfs_ino(inode
);
1914 ins
.offset
= file_pos
;
1915 ins
.type
= BTRFS_EXTENT_DATA_KEY
;
1917 path
->leave_spinning
= 1;
1918 ret
= btrfs_insert_empty_item(trans
, root
, path
, &ins
,
1923 leaf
= path
->nodes
[0];
1924 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1925 struct btrfs_file_extent_item
);
1926 btrfs_set_file_extent_generation(leaf
, fi
, trans
->transid
);
1927 btrfs_set_file_extent_type(leaf
, fi
, extent_type
);
1928 btrfs_set_file_extent_disk_bytenr(leaf
, fi
, disk_bytenr
);
1929 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
, disk_num_bytes
);
1930 btrfs_set_file_extent_offset(leaf
, fi
, 0);
1931 btrfs_set_file_extent_num_bytes(leaf
, fi
, num_bytes
);
1932 btrfs_set_file_extent_ram_bytes(leaf
, fi
, ram_bytes
);
1933 btrfs_set_file_extent_compression(leaf
, fi
, compression
);
1934 btrfs_set_file_extent_encryption(leaf
, fi
, encryption
);
1935 btrfs_set_file_extent_other_encoding(leaf
, fi
, other_encoding
);
1937 btrfs_mark_buffer_dirty(leaf
);
1938 btrfs_release_path(path
);
1940 inode_add_bytes(inode
, num_bytes
);
1942 ins
.objectid
= disk_bytenr
;
1943 ins
.offset
= disk_num_bytes
;
1944 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
1945 ret
= btrfs_alloc_reserved_file_extent(trans
, root
,
1946 root
->root_key
.objectid
,
1947 btrfs_ino(inode
), file_pos
, &ins
);
1949 btrfs_free_path(path
);
1954 /* snapshot-aware defrag */
1955 struct sa_defrag_extent_backref
{
1956 struct rb_node node
;
1957 struct old_sa_defrag_extent
*old
;
1966 struct old_sa_defrag_extent
{
1967 struct list_head list
;
1968 struct new_sa_defrag_extent
*new;
1977 struct new_sa_defrag_extent
{
1978 struct rb_root root
;
1979 struct list_head head
;
1980 struct btrfs_path
*path
;
1981 struct inode
*inode
;
1989 static int backref_comp(struct sa_defrag_extent_backref
*b1
,
1990 struct sa_defrag_extent_backref
*b2
)
1992 if (b1
->root_id
< b2
->root_id
)
1994 else if (b1
->root_id
> b2
->root_id
)
1997 if (b1
->inum
< b2
->inum
)
1999 else if (b1
->inum
> b2
->inum
)
2002 if (b1
->file_pos
< b2
->file_pos
)
2004 else if (b1
->file_pos
> b2
->file_pos
)
2008 * [------------------------------] ===> (a range of space)
2009 * |<--->| |<---->| =============> (fs/file tree A)
2010 * |<---------------------------->| ===> (fs/file tree B)
2012 * A range of space can refer to two file extents in one tree while
2013 * refer to only one file extent in another tree.
2015 * So we may process a disk offset more than one time(two extents in A)
2016 * and locate at the same extent(one extent in B), then insert two same
2017 * backrefs(both refer to the extent in B).
2022 static void backref_insert(struct rb_root
*root
,
2023 struct sa_defrag_extent_backref
*backref
)
2025 struct rb_node
**p
= &root
->rb_node
;
2026 struct rb_node
*parent
= NULL
;
2027 struct sa_defrag_extent_backref
*entry
;
2032 entry
= rb_entry(parent
, struct sa_defrag_extent_backref
, node
);
2034 ret
= backref_comp(backref
, entry
);
2038 p
= &(*p
)->rb_right
;
2041 rb_link_node(&backref
->node
, parent
, p
);
2042 rb_insert_color(&backref
->node
, root
);
2046 * Note the backref might has changed, and in this case we just return 0.
2048 static noinline
int record_one_backref(u64 inum
, u64 offset
, u64 root_id
,
2051 struct btrfs_file_extent_item
*extent
;
2052 struct btrfs_fs_info
*fs_info
;
2053 struct old_sa_defrag_extent
*old
= ctx
;
2054 struct new_sa_defrag_extent
*new = old
->new;
2055 struct btrfs_path
*path
= new->path
;
2056 struct btrfs_key key
;
2057 struct btrfs_root
*root
;
2058 struct sa_defrag_extent_backref
*backref
;
2059 struct extent_buffer
*leaf
;
2060 struct inode
*inode
= new->inode
;
2066 if (BTRFS_I(inode
)->root
->root_key
.objectid
== root_id
&&
2067 inum
== btrfs_ino(inode
))
2070 key
.objectid
= root_id
;
2071 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2072 key
.offset
= (u64
)-1;
2074 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2075 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2077 if (PTR_ERR(root
) == -ENOENT
)
2080 pr_debug("inum=%llu, offset=%llu, root_id=%llu\n",
2081 inum
, offset
, root_id
);
2082 return PTR_ERR(root
);
2085 key
.objectid
= inum
;
2086 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2087 if (offset
> (u64
)-1 << 32)
2090 key
.offset
= offset
;
2092 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2093 if (WARN_ON(ret
< 0))
2100 leaf
= path
->nodes
[0];
2101 slot
= path
->slots
[0];
2103 if (slot
>= btrfs_header_nritems(leaf
)) {
2104 ret
= btrfs_next_leaf(root
, path
);
2107 } else if (ret
> 0) {
2116 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2118 if (key
.objectid
> inum
)
2121 if (key
.objectid
< inum
|| key
.type
!= BTRFS_EXTENT_DATA_KEY
)
2124 extent
= btrfs_item_ptr(leaf
, slot
,
2125 struct btrfs_file_extent_item
);
2127 if (btrfs_file_extent_disk_bytenr(leaf
, extent
) != old
->bytenr
)
2131 * 'offset' refers to the exact key.offset,
2132 * NOT the 'offset' field in btrfs_extent_data_ref, ie.
2133 * (key.offset - extent_offset).
2135 if (key
.offset
!= offset
)
2138 extent_offset
= btrfs_file_extent_offset(leaf
, extent
);
2139 num_bytes
= btrfs_file_extent_num_bytes(leaf
, extent
);
2141 if (extent_offset
>= old
->extent_offset
+ old
->offset
+
2142 old
->len
|| extent_offset
+ num_bytes
<=
2143 old
->extent_offset
+ old
->offset
)
2148 backref
= kmalloc(sizeof(*backref
), GFP_NOFS
);
2154 backref
->root_id
= root_id
;
2155 backref
->inum
= inum
;
2156 backref
->file_pos
= offset
;
2157 backref
->num_bytes
= num_bytes
;
2158 backref
->extent_offset
= extent_offset
;
2159 backref
->generation
= btrfs_file_extent_generation(leaf
, extent
);
2161 backref_insert(&new->root
, backref
);
2164 btrfs_release_path(path
);
2169 static noinline
bool record_extent_backrefs(struct btrfs_path
*path
,
2170 struct new_sa_defrag_extent
*new)
2172 struct btrfs_fs_info
*fs_info
= BTRFS_I(new->inode
)->root
->fs_info
;
2173 struct old_sa_defrag_extent
*old
, *tmp
;
2178 list_for_each_entry_safe(old
, tmp
, &new->head
, list
) {
2179 ret
= iterate_inodes_from_logical(old
->bytenr
+
2180 old
->extent_offset
, fs_info
,
2181 path
, record_one_backref
,
2183 if (ret
< 0 && ret
!= -ENOENT
)
2186 /* no backref to be processed for this extent */
2188 list_del(&old
->list
);
2193 if (list_empty(&new->head
))
2199 static int relink_is_mergable(struct extent_buffer
*leaf
,
2200 struct btrfs_file_extent_item
*fi
,
2201 struct new_sa_defrag_extent
*new)
2203 if (btrfs_file_extent_disk_bytenr(leaf
, fi
) != new->bytenr
)
2206 if (btrfs_file_extent_type(leaf
, fi
) != BTRFS_FILE_EXTENT_REG
)
2209 if (btrfs_file_extent_compression(leaf
, fi
) != new->compress_type
)
2212 if (btrfs_file_extent_encryption(leaf
, fi
) ||
2213 btrfs_file_extent_other_encoding(leaf
, fi
))
2220 * Note the backref might has changed, and in this case we just return 0.
2222 static noinline
int relink_extent_backref(struct btrfs_path
*path
,
2223 struct sa_defrag_extent_backref
*prev
,
2224 struct sa_defrag_extent_backref
*backref
)
2226 struct btrfs_file_extent_item
*extent
;
2227 struct btrfs_file_extent_item
*item
;
2228 struct btrfs_ordered_extent
*ordered
;
2229 struct btrfs_trans_handle
*trans
;
2230 struct btrfs_fs_info
*fs_info
;
2231 struct btrfs_root
*root
;
2232 struct btrfs_key key
;
2233 struct extent_buffer
*leaf
;
2234 struct old_sa_defrag_extent
*old
= backref
->old
;
2235 struct new_sa_defrag_extent
*new = old
->new;
2236 struct inode
*src_inode
= new->inode
;
2237 struct inode
*inode
;
2238 struct extent_state
*cached
= NULL
;
2247 if (prev
&& prev
->root_id
== backref
->root_id
&&
2248 prev
->inum
== backref
->inum
&&
2249 prev
->file_pos
+ prev
->num_bytes
== backref
->file_pos
)
2252 /* step 1: get root */
2253 key
.objectid
= backref
->root_id
;
2254 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2255 key
.offset
= (u64
)-1;
2257 fs_info
= BTRFS_I(src_inode
)->root
->fs_info
;
2258 index
= srcu_read_lock(&fs_info
->subvol_srcu
);
2260 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2262 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2263 if (PTR_ERR(root
) == -ENOENT
)
2265 return PTR_ERR(root
);
2268 if (btrfs_root_readonly(root
)) {
2269 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2273 /* step 2: get inode */
2274 key
.objectid
= backref
->inum
;
2275 key
.type
= BTRFS_INODE_ITEM_KEY
;
2278 inode
= btrfs_iget(fs_info
->sb
, &key
, root
, NULL
);
2279 if (IS_ERR(inode
)) {
2280 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2284 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2286 /* step 3: relink backref */
2287 lock_start
= backref
->file_pos
;
2288 lock_end
= backref
->file_pos
+ backref
->num_bytes
- 1;
2289 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lock_start
, lock_end
,
2292 ordered
= btrfs_lookup_first_ordered_extent(inode
, lock_end
);
2294 btrfs_put_ordered_extent(ordered
);
2298 trans
= btrfs_join_transaction(root
);
2299 if (IS_ERR(trans
)) {
2300 ret
= PTR_ERR(trans
);
2304 key
.objectid
= backref
->inum
;
2305 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2306 key
.offset
= backref
->file_pos
;
2308 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2311 } else if (ret
> 0) {
2316 extent
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
2317 struct btrfs_file_extent_item
);
2319 if (btrfs_file_extent_generation(path
->nodes
[0], extent
) !=
2320 backref
->generation
)
2323 btrfs_release_path(path
);
2325 start
= backref
->file_pos
;
2326 if (backref
->extent_offset
< old
->extent_offset
+ old
->offset
)
2327 start
+= old
->extent_offset
+ old
->offset
-
2328 backref
->extent_offset
;
2330 len
= min(backref
->extent_offset
+ backref
->num_bytes
,
2331 old
->extent_offset
+ old
->offset
+ old
->len
);
2332 len
-= max(backref
->extent_offset
, old
->extent_offset
+ old
->offset
);
2334 ret
= btrfs_drop_extents(trans
, root
, inode
, start
,
2339 key
.objectid
= btrfs_ino(inode
);
2340 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2343 path
->leave_spinning
= 1;
2345 struct btrfs_file_extent_item
*fi
;
2347 struct btrfs_key found_key
;
2349 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2354 leaf
= path
->nodes
[0];
2355 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2357 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
2358 struct btrfs_file_extent_item
);
2359 extent_len
= btrfs_file_extent_num_bytes(leaf
, fi
);
2361 if (extent_len
+ found_key
.offset
== start
&&
2362 relink_is_mergable(leaf
, fi
, new)) {
2363 btrfs_set_file_extent_num_bytes(leaf
, fi
,
2365 btrfs_mark_buffer_dirty(leaf
);
2366 inode_add_bytes(inode
, len
);
2372 btrfs_release_path(path
);
2377 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2380 btrfs_abort_transaction(trans
, root
, ret
);
2384 leaf
= path
->nodes
[0];
2385 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2386 struct btrfs_file_extent_item
);
2387 btrfs_set_file_extent_disk_bytenr(leaf
, item
, new->bytenr
);
2388 btrfs_set_file_extent_disk_num_bytes(leaf
, item
, new->disk_len
);
2389 btrfs_set_file_extent_offset(leaf
, item
, start
- new->file_pos
);
2390 btrfs_set_file_extent_num_bytes(leaf
, item
, len
);
2391 btrfs_set_file_extent_ram_bytes(leaf
, item
, new->len
);
2392 btrfs_set_file_extent_generation(leaf
, item
, trans
->transid
);
2393 btrfs_set_file_extent_type(leaf
, item
, BTRFS_FILE_EXTENT_REG
);
2394 btrfs_set_file_extent_compression(leaf
, item
, new->compress_type
);
2395 btrfs_set_file_extent_encryption(leaf
, item
, 0);
2396 btrfs_set_file_extent_other_encoding(leaf
, item
, 0);
2398 btrfs_mark_buffer_dirty(leaf
);
2399 inode_add_bytes(inode
, len
);
2400 btrfs_release_path(path
);
2402 ret
= btrfs_inc_extent_ref(trans
, root
, new->bytenr
,
2404 backref
->root_id
, backref
->inum
,
2405 new->file_pos
, 0); /* start - extent_offset */
2407 btrfs_abort_transaction(trans
, root
, ret
);
2413 btrfs_release_path(path
);
2414 path
->leave_spinning
= 0;
2415 btrfs_end_transaction(trans
, root
);
2417 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lock_start
, lock_end
,
2423 static void free_sa_defrag_extent(struct new_sa_defrag_extent
*new)
2425 struct old_sa_defrag_extent
*old
, *tmp
;
2430 list_for_each_entry_safe(old
, tmp
, &new->head
, list
) {
2431 list_del(&old
->list
);
2437 static void relink_file_extents(struct new_sa_defrag_extent
*new)
2439 struct btrfs_path
*path
;
2440 struct sa_defrag_extent_backref
*backref
;
2441 struct sa_defrag_extent_backref
*prev
= NULL
;
2442 struct inode
*inode
;
2443 struct btrfs_root
*root
;
2444 struct rb_node
*node
;
2448 root
= BTRFS_I(inode
)->root
;
2450 path
= btrfs_alloc_path();
2454 if (!record_extent_backrefs(path
, new)) {
2455 btrfs_free_path(path
);
2458 btrfs_release_path(path
);
2461 node
= rb_first(&new->root
);
2464 rb_erase(node
, &new->root
);
2466 backref
= rb_entry(node
, struct sa_defrag_extent_backref
, node
);
2468 ret
= relink_extent_backref(path
, prev
, backref
);
2481 btrfs_free_path(path
);
2483 free_sa_defrag_extent(new);
2485 atomic_dec(&root
->fs_info
->defrag_running
);
2486 wake_up(&root
->fs_info
->transaction_wait
);
2489 static struct new_sa_defrag_extent
*
2490 record_old_file_extents(struct inode
*inode
,
2491 struct btrfs_ordered_extent
*ordered
)
2493 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2494 struct btrfs_path
*path
;
2495 struct btrfs_key key
;
2496 struct old_sa_defrag_extent
*old
;
2497 struct new_sa_defrag_extent
*new;
2500 new = kmalloc(sizeof(*new), GFP_NOFS
);
2505 new->file_pos
= ordered
->file_offset
;
2506 new->len
= ordered
->len
;
2507 new->bytenr
= ordered
->start
;
2508 new->disk_len
= ordered
->disk_len
;
2509 new->compress_type
= ordered
->compress_type
;
2510 new->root
= RB_ROOT
;
2511 INIT_LIST_HEAD(&new->head
);
2513 path
= btrfs_alloc_path();
2517 key
.objectid
= btrfs_ino(inode
);
2518 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2519 key
.offset
= new->file_pos
;
2521 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2524 if (ret
> 0 && path
->slots
[0] > 0)
2527 /* find out all the old extents for the file range */
2529 struct btrfs_file_extent_item
*extent
;
2530 struct extent_buffer
*l
;
2539 slot
= path
->slots
[0];
2541 if (slot
>= btrfs_header_nritems(l
)) {
2542 ret
= btrfs_next_leaf(root
, path
);
2550 btrfs_item_key_to_cpu(l
, &key
, slot
);
2552 if (key
.objectid
!= btrfs_ino(inode
))
2554 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
2556 if (key
.offset
>= new->file_pos
+ new->len
)
2559 extent
= btrfs_item_ptr(l
, slot
, struct btrfs_file_extent_item
);
2561 num_bytes
= btrfs_file_extent_num_bytes(l
, extent
);
2562 if (key
.offset
+ num_bytes
< new->file_pos
)
2565 disk_bytenr
= btrfs_file_extent_disk_bytenr(l
, extent
);
2569 extent_offset
= btrfs_file_extent_offset(l
, extent
);
2571 old
= kmalloc(sizeof(*old
), GFP_NOFS
);
2575 offset
= max(new->file_pos
, key
.offset
);
2576 end
= min(new->file_pos
+ new->len
, key
.offset
+ num_bytes
);
2578 old
->bytenr
= disk_bytenr
;
2579 old
->extent_offset
= extent_offset
;
2580 old
->offset
= offset
- key
.offset
;
2581 old
->len
= end
- offset
;
2584 list_add_tail(&old
->list
, &new->head
);
2590 btrfs_free_path(path
);
2591 atomic_inc(&root
->fs_info
->defrag_running
);
2596 btrfs_free_path(path
);
2598 free_sa_defrag_extent(new);
2602 static void btrfs_release_delalloc_bytes(struct btrfs_root
*root
,
2605 struct btrfs_block_group_cache
*cache
;
2607 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
2610 spin_lock(&cache
->lock
);
2611 cache
->delalloc_bytes
-= len
;
2612 spin_unlock(&cache
->lock
);
2614 btrfs_put_block_group(cache
);
2617 /* as ordered data IO finishes, this gets called so we can finish
2618 * an ordered extent if the range of bytes in the file it covers are
2621 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
)
2623 struct inode
*inode
= ordered_extent
->inode
;
2624 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2625 struct btrfs_trans_handle
*trans
= NULL
;
2626 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2627 struct extent_state
*cached_state
= NULL
;
2628 struct new_sa_defrag_extent
*new = NULL
;
2629 int compress_type
= 0;
2631 u64 logical_len
= ordered_extent
->len
;
2633 bool truncated
= false;
2635 nolock
= btrfs_is_free_space_inode(inode
);
2637 if (test_bit(BTRFS_ORDERED_IOERR
, &ordered_extent
->flags
)) {
2642 if (test_bit(BTRFS_ORDERED_TRUNCATED
, &ordered_extent
->flags
)) {
2644 logical_len
= ordered_extent
->truncated_len
;
2645 /* Truncated the entire extent, don't bother adding */
2650 if (test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
)) {
2651 BUG_ON(!list_empty(&ordered_extent
->list
)); /* Logic error */
2652 btrfs_ordered_update_i_size(inode
, 0, ordered_extent
);
2654 trans
= btrfs_join_transaction_nolock(root
);
2656 trans
= btrfs_join_transaction(root
);
2657 if (IS_ERR(trans
)) {
2658 ret
= PTR_ERR(trans
);
2662 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
2663 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2664 if (ret
) /* -ENOMEM or corruption */
2665 btrfs_abort_transaction(trans
, root
, ret
);
2669 lock_extent_bits(io_tree
, ordered_extent
->file_offset
,
2670 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2673 ret
= test_range_bit(io_tree
, ordered_extent
->file_offset
,
2674 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2675 EXTENT_DEFRAG
, 1, cached_state
);
2677 u64 last_snapshot
= btrfs_root_last_snapshot(&root
->root_item
);
2678 if (0 && last_snapshot
>= BTRFS_I(inode
)->generation
)
2679 /* the inode is shared */
2680 new = record_old_file_extents(inode
, ordered_extent
);
2682 clear_extent_bit(io_tree
, ordered_extent
->file_offset
,
2683 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2684 EXTENT_DEFRAG
, 0, 0, &cached_state
, GFP_NOFS
);
2688 trans
= btrfs_join_transaction_nolock(root
);
2690 trans
= btrfs_join_transaction(root
);
2691 if (IS_ERR(trans
)) {
2692 ret
= PTR_ERR(trans
);
2697 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
2699 if (test_bit(BTRFS_ORDERED_COMPRESSED
, &ordered_extent
->flags
))
2700 compress_type
= ordered_extent
->compress_type
;
2701 if (test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
)) {
2702 BUG_ON(compress_type
);
2703 ret
= btrfs_mark_extent_written(trans
, inode
,
2704 ordered_extent
->file_offset
,
2705 ordered_extent
->file_offset
+
2708 BUG_ON(root
== root
->fs_info
->tree_root
);
2709 ret
= insert_reserved_file_extent(trans
, inode
,
2710 ordered_extent
->file_offset
,
2711 ordered_extent
->start
,
2712 ordered_extent
->disk_len
,
2713 logical_len
, logical_len
,
2714 compress_type
, 0, 0,
2715 BTRFS_FILE_EXTENT_REG
);
2717 btrfs_release_delalloc_bytes(root
,
2718 ordered_extent
->start
,
2719 ordered_extent
->disk_len
);
2721 unpin_extent_cache(&BTRFS_I(inode
)->extent_tree
,
2722 ordered_extent
->file_offset
, ordered_extent
->len
,
2725 btrfs_abort_transaction(trans
, root
, ret
);
2729 add_pending_csums(trans
, inode
, ordered_extent
->file_offset
,
2730 &ordered_extent
->list
);
2732 btrfs_ordered_update_i_size(inode
, 0, ordered_extent
);
2733 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2734 if (ret
) { /* -ENOMEM or corruption */
2735 btrfs_abort_transaction(trans
, root
, ret
);
2740 unlock_extent_cached(io_tree
, ordered_extent
->file_offset
,
2741 ordered_extent
->file_offset
+
2742 ordered_extent
->len
- 1, &cached_state
, GFP_NOFS
);
2744 if (root
!= root
->fs_info
->tree_root
)
2745 btrfs_delalloc_release_metadata(inode
, ordered_extent
->len
);
2747 btrfs_end_transaction(trans
, root
);
2749 if (ret
|| truncated
) {
2753 start
= ordered_extent
->file_offset
+ logical_len
;
2755 start
= ordered_extent
->file_offset
;
2756 end
= ordered_extent
->file_offset
+ ordered_extent
->len
- 1;
2757 clear_extent_uptodate(io_tree
, start
, end
, NULL
, GFP_NOFS
);
2759 /* Drop the cache for the part of the extent we didn't write. */
2760 btrfs_drop_extent_cache(inode
, start
, end
, 0);
2763 * If the ordered extent had an IOERR or something else went
2764 * wrong we need to return the space for this ordered extent
2765 * back to the allocator. We only free the extent in the
2766 * truncated case if we didn't write out the extent at all.
2768 if ((ret
|| !logical_len
) &&
2769 !test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
) &&
2770 !test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
))
2771 btrfs_free_reserved_extent(root
, ordered_extent
->start
,
2772 ordered_extent
->disk_len
, 1);
2777 * This needs to be done to make sure anybody waiting knows we are done
2778 * updating everything for this ordered extent.
2780 btrfs_remove_ordered_extent(inode
, ordered_extent
);
2782 /* for snapshot-aware defrag */
2785 free_sa_defrag_extent(new);
2786 atomic_dec(&root
->fs_info
->defrag_running
);
2788 relink_file_extents(new);
2793 btrfs_put_ordered_extent(ordered_extent
);
2794 /* once for the tree */
2795 btrfs_put_ordered_extent(ordered_extent
);
2800 static void finish_ordered_fn(struct btrfs_work
*work
)
2802 struct btrfs_ordered_extent
*ordered_extent
;
2803 ordered_extent
= container_of(work
, struct btrfs_ordered_extent
, work
);
2804 btrfs_finish_ordered_io(ordered_extent
);
2807 static int btrfs_writepage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
2808 struct extent_state
*state
, int uptodate
)
2810 struct inode
*inode
= page
->mapping
->host
;
2811 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2812 struct btrfs_ordered_extent
*ordered_extent
= NULL
;
2813 struct btrfs_workqueue
*workers
;
2815 trace_btrfs_writepage_end_io_hook(page
, start
, end
, uptodate
);
2817 ClearPagePrivate2(page
);
2818 if (!btrfs_dec_test_ordered_pending(inode
, &ordered_extent
, start
,
2819 end
- start
+ 1, uptodate
))
2822 btrfs_init_work(&ordered_extent
->work
, finish_ordered_fn
, NULL
, NULL
);
2824 if (btrfs_is_free_space_inode(inode
))
2825 workers
= root
->fs_info
->endio_freespace_worker
;
2827 workers
= root
->fs_info
->endio_write_workers
;
2828 btrfs_queue_work(workers
, &ordered_extent
->work
);
2834 * when reads are done, we need to check csums to verify the data is correct
2835 * if there's a match, we allow the bio to finish. If not, the code in
2836 * extent_io.c will try to find good copies for us.
2838 static int btrfs_readpage_end_io_hook(struct btrfs_io_bio
*io_bio
,
2839 u64 phy_offset
, struct page
*page
,
2840 u64 start
, u64 end
, int mirror
)
2842 size_t offset
= start
- page_offset(page
);
2843 struct inode
*inode
= page
->mapping
->host
;
2844 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2846 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2849 static DEFINE_RATELIMIT_STATE(_rs
, DEFAULT_RATELIMIT_INTERVAL
,
2850 DEFAULT_RATELIMIT_BURST
);
2852 if (PageChecked(page
)) {
2853 ClearPageChecked(page
);
2857 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)
2860 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
&&
2861 test_range_bit(io_tree
, start
, end
, EXTENT_NODATASUM
, 1, NULL
)) {
2862 clear_extent_bits(io_tree
, start
, end
, EXTENT_NODATASUM
,
2867 phy_offset
>>= inode
->i_sb
->s_blocksize_bits
;
2868 csum_expected
= *(((u32
*)io_bio
->csum
) + phy_offset
);
2870 kaddr
= kmap_atomic(page
);
2871 csum
= btrfs_csum_data(kaddr
+ offset
, csum
, end
- start
+ 1);
2872 btrfs_csum_final(csum
, (char *)&csum
);
2873 if (csum
!= csum_expected
)
2876 kunmap_atomic(kaddr
);
2881 if (__ratelimit(&_rs
))
2882 btrfs_info(root
->fs_info
, "csum failed ino %llu off %llu csum %u expected csum %u",
2883 btrfs_ino(page
->mapping
->host
), start
, csum
, csum_expected
);
2884 memset(kaddr
+ offset
, 1, end
- start
+ 1);
2885 flush_dcache_page(page
);
2886 kunmap_atomic(kaddr
);
2887 if (csum_expected
== 0)
2892 struct delayed_iput
{
2893 struct list_head list
;
2894 struct inode
*inode
;
2897 /* JDM: If this is fs-wide, why can't we add a pointer to
2898 * btrfs_inode instead and avoid the allocation? */
2899 void btrfs_add_delayed_iput(struct inode
*inode
)
2901 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2902 struct delayed_iput
*delayed
;
2904 if (atomic_add_unless(&inode
->i_count
, -1, 1))
2907 delayed
= kmalloc(sizeof(*delayed
), GFP_NOFS
| __GFP_NOFAIL
);
2908 delayed
->inode
= inode
;
2910 spin_lock(&fs_info
->delayed_iput_lock
);
2911 list_add_tail(&delayed
->list
, &fs_info
->delayed_iputs
);
2912 spin_unlock(&fs_info
->delayed_iput_lock
);
2915 void btrfs_run_delayed_iputs(struct btrfs_root
*root
)
2918 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2919 struct delayed_iput
*delayed
;
2922 spin_lock(&fs_info
->delayed_iput_lock
);
2923 empty
= list_empty(&fs_info
->delayed_iputs
);
2924 spin_unlock(&fs_info
->delayed_iput_lock
);
2928 spin_lock(&fs_info
->delayed_iput_lock
);
2929 list_splice_init(&fs_info
->delayed_iputs
, &list
);
2930 spin_unlock(&fs_info
->delayed_iput_lock
);
2932 while (!list_empty(&list
)) {
2933 delayed
= list_entry(list
.next
, struct delayed_iput
, list
);
2934 list_del(&delayed
->list
);
2935 iput(delayed
->inode
);
2941 * This is called in transaction commit time. If there are no orphan
2942 * files in the subvolume, it removes orphan item and frees block_rsv
2945 void btrfs_orphan_commit_root(struct btrfs_trans_handle
*trans
,
2946 struct btrfs_root
*root
)
2948 struct btrfs_block_rsv
*block_rsv
;
2951 if (atomic_read(&root
->orphan_inodes
) ||
2952 root
->orphan_cleanup_state
!= ORPHAN_CLEANUP_DONE
)
2955 spin_lock(&root
->orphan_lock
);
2956 if (atomic_read(&root
->orphan_inodes
)) {
2957 spin_unlock(&root
->orphan_lock
);
2961 if (root
->orphan_cleanup_state
!= ORPHAN_CLEANUP_DONE
) {
2962 spin_unlock(&root
->orphan_lock
);
2966 block_rsv
= root
->orphan_block_rsv
;
2967 root
->orphan_block_rsv
= NULL
;
2968 spin_unlock(&root
->orphan_lock
);
2970 if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
) &&
2971 btrfs_root_refs(&root
->root_item
) > 0) {
2972 ret
= btrfs_del_orphan_item(trans
, root
->fs_info
->tree_root
,
2973 root
->root_key
.objectid
);
2975 btrfs_abort_transaction(trans
, root
, ret
);
2977 clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
,
2982 WARN_ON(block_rsv
->size
> 0);
2983 btrfs_free_block_rsv(root
, block_rsv
);
2988 * This creates an orphan entry for the given inode in case something goes
2989 * wrong in the middle of an unlink/truncate.
2991 * NOTE: caller of this function should reserve 5 units of metadata for
2994 int btrfs_orphan_add(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
2996 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2997 struct btrfs_block_rsv
*block_rsv
= NULL
;
3002 if (!root
->orphan_block_rsv
) {
3003 block_rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
3008 spin_lock(&root
->orphan_lock
);
3009 if (!root
->orphan_block_rsv
) {
3010 root
->orphan_block_rsv
= block_rsv
;
3011 } else if (block_rsv
) {
3012 btrfs_free_block_rsv(root
, block_rsv
);
3016 if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3017 &BTRFS_I(inode
)->runtime_flags
)) {
3020 * For proper ENOSPC handling, we should do orphan
3021 * cleanup when mounting. But this introduces backward
3022 * compatibility issue.
3024 if (!xchg(&root
->orphan_item_inserted
, 1))
3030 atomic_inc(&root
->orphan_inodes
);
3033 if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3034 &BTRFS_I(inode
)->runtime_flags
))
3036 spin_unlock(&root
->orphan_lock
);
3038 /* grab metadata reservation from transaction handle */
3040 ret
= btrfs_orphan_reserve_metadata(trans
, inode
);
3041 BUG_ON(ret
); /* -ENOSPC in reservation; Logic error? JDM */
3044 /* insert an orphan item to track this unlinked/truncated file */
3046 ret
= btrfs_insert_orphan_item(trans
, root
, btrfs_ino(inode
));
3048 atomic_dec(&root
->orphan_inodes
);
3050 clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3051 &BTRFS_I(inode
)->runtime_flags
);
3052 btrfs_orphan_release_metadata(inode
);
3054 if (ret
!= -EEXIST
) {
3055 clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3056 &BTRFS_I(inode
)->runtime_flags
);
3057 btrfs_abort_transaction(trans
, root
, ret
);
3064 /* insert an orphan item to track subvolume contains orphan files */
3066 ret
= btrfs_insert_orphan_item(trans
, root
->fs_info
->tree_root
,
3067 root
->root_key
.objectid
);
3068 if (ret
&& ret
!= -EEXIST
) {
3069 btrfs_abort_transaction(trans
, root
, ret
);
3077 * We have done the truncate/delete so we can go ahead and remove the orphan
3078 * item for this particular inode.
3080 static int btrfs_orphan_del(struct btrfs_trans_handle
*trans
,
3081 struct inode
*inode
)
3083 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3084 int delete_item
= 0;
3085 int release_rsv
= 0;
3088 spin_lock(&root
->orphan_lock
);
3089 if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3090 &BTRFS_I(inode
)->runtime_flags
))
3093 if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3094 &BTRFS_I(inode
)->runtime_flags
))
3096 spin_unlock(&root
->orphan_lock
);
3099 atomic_dec(&root
->orphan_inodes
);
3101 ret
= btrfs_del_orphan_item(trans
, root
,
3106 btrfs_orphan_release_metadata(inode
);
3112 * this cleans up any orphans that may be left on the list from the last use
3115 int btrfs_orphan_cleanup(struct btrfs_root
*root
)
3117 struct btrfs_path
*path
;
3118 struct extent_buffer
*leaf
;
3119 struct btrfs_key key
, found_key
;
3120 struct btrfs_trans_handle
*trans
;
3121 struct inode
*inode
;
3122 u64 last_objectid
= 0;
3123 int ret
= 0, nr_unlink
= 0, nr_truncate
= 0;
3125 if (cmpxchg(&root
->orphan_cleanup_state
, 0, ORPHAN_CLEANUP_STARTED
))
3128 path
= btrfs_alloc_path();
3135 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
3136 btrfs_set_key_type(&key
, BTRFS_ORPHAN_ITEM_KEY
);
3137 key
.offset
= (u64
)-1;
3140 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3145 * if ret == 0 means we found what we were searching for, which
3146 * is weird, but possible, so only screw with path if we didn't
3147 * find the key and see if we have stuff that matches
3151 if (path
->slots
[0] == 0)
3156 /* pull out the item */
3157 leaf
= path
->nodes
[0];
3158 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3160 /* make sure the item matches what we want */
3161 if (found_key
.objectid
!= BTRFS_ORPHAN_OBJECTID
)
3163 if (btrfs_key_type(&found_key
) != BTRFS_ORPHAN_ITEM_KEY
)
3166 /* release the path since we're done with it */
3167 btrfs_release_path(path
);
3170 * this is where we are basically btrfs_lookup, without the
3171 * crossing root thing. we store the inode number in the
3172 * offset of the orphan item.
3175 if (found_key
.offset
== last_objectid
) {
3176 btrfs_err(root
->fs_info
,
3177 "Error removing orphan entry, stopping orphan cleanup");
3182 last_objectid
= found_key
.offset
;
3184 found_key
.objectid
= found_key
.offset
;
3185 found_key
.type
= BTRFS_INODE_ITEM_KEY
;
3186 found_key
.offset
= 0;
3187 inode
= btrfs_iget(root
->fs_info
->sb
, &found_key
, root
, NULL
);
3188 ret
= PTR_ERR_OR_ZERO(inode
);
3189 if (ret
&& ret
!= -ESTALE
)
3192 if (ret
== -ESTALE
&& root
== root
->fs_info
->tree_root
) {
3193 struct btrfs_root
*dead_root
;
3194 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3195 int is_dead_root
= 0;
3198 * this is an orphan in the tree root. Currently these
3199 * could come from 2 sources:
3200 * a) a snapshot deletion in progress
3201 * b) a free space cache inode
3202 * We need to distinguish those two, as the snapshot
3203 * orphan must not get deleted.
3204 * find_dead_roots already ran before us, so if this
3205 * is a snapshot deletion, we should find the root
3206 * in the dead_roots list
3208 spin_lock(&fs_info
->trans_lock
);
3209 list_for_each_entry(dead_root
, &fs_info
->dead_roots
,
3211 if (dead_root
->root_key
.objectid
==
3212 found_key
.objectid
) {
3217 spin_unlock(&fs_info
->trans_lock
);
3219 /* prevent this orphan from being found again */
3220 key
.offset
= found_key
.objectid
- 1;
3225 * Inode is already gone but the orphan item is still there,
3226 * kill the orphan item.
3228 if (ret
== -ESTALE
) {
3229 trans
= btrfs_start_transaction(root
, 1);
3230 if (IS_ERR(trans
)) {
3231 ret
= PTR_ERR(trans
);
3234 btrfs_debug(root
->fs_info
, "auto deleting %Lu",
3235 found_key
.objectid
);
3236 ret
= btrfs_del_orphan_item(trans
, root
,
3237 found_key
.objectid
);
3238 btrfs_end_transaction(trans
, root
);
3245 * add this inode to the orphan list so btrfs_orphan_del does
3246 * the proper thing when we hit it
3248 set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3249 &BTRFS_I(inode
)->runtime_flags
);
3250 atomic_inc(&root
->orphan_inodes
);
3252 /* if we have links, this was a truncate, lets do that */
3253 if (inode
->i_nlink
) {
3254 if (WARN_ON(!S_ISREG(inode
->i_mode
))) {
3260 /* 1 for the orphan item deletion. */
3261 trans
= btrfs_start_transaction(root
, 1);
3262 if (IS_ERR(trans
)) {
3264 ret
= PTR_ERR(trans
);
3267 ret
= btrfs_orphan_add(trans
, inode
);
3268 btrfs_end_transaction(trans
, root
);
3274 ret
= btrfs_truncate(inode
);
3276 btrfs_orphan_del(NULL
, inode
);
3281 /* this will do delete_inode and everything for us */
3286 /* release the path since we're done with it */
3287 btrfs_release_path(path
);
3289 root
->orphan_cleanup_state
= ORPHAN_CLEANUP_DONE
;
3291 if (root
->orphan_block_rsv
)
3292 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
,
3295 if (root
->orphan_block_rsv
||
3296 test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
)) {
3297 trans
= btrfs_join_transaction(root
);
3299 btrfs_end_transaction(trans
, root
);
3303 btrfs_debug(root
->fs_info
, "unlinked %d orphans", nr_unlink
);
3305 btrfs_debug(root
->fs_info
, "truncated %d orphans", nr_truncate
);
3309 btrfs_crit(root
->fs_info
,
3310 "could not do orphan cleanup %d", ret
);
3311 btrfs_free_path(path
);
3316 * very simple check to peek ahead in the leaf looking for xattrs. If we
3317 * don't find any xattrs, we know there can't be any acls.
3319 * slot is the slot the inode is in, objectid is the objectid of the inode
3321 static noinline
int acls_after_inode_item(struct extent_buffer
*leaf
,
3322 int slot
, u64 objectid
,
3323 int *first_xattr_slot
)
3325 u32 nritems
= btrfs_header_nritems(leaf
);
3326 struct btrfs_key found_key
;
3327 static u64 xattr_access
= 0;
3328 static u64 xattr_default
= 0;
3331 if (!xattr_access
) {
3332 xattr_access
= btrfs_name_hash(POSIX_ACL_XATTR_ACCESS
,
3333 strlen(POSIX_ACL_XATTR_ACCESS
));
3334 xattr_default
= btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT
,
3335 strlen(POSIX_ACL_XATTR_DEFAULT
));
3339 *first_xattr_slot
= -1;
3340 while (slot
< nritems
) {
3341 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3343 /* we found a different objectid, there must not be acls */
3344 if (found_key
.objectid
!= objectid
)
3347 /* we found an xattr, assume we've got an acl */
3348 if (found_key
.type
== BTRFS_XATTR_ITEM_KEY
) {
3349 if (*first_xattr_slot
== -1)
3350 *first_xattr_slot
= slot
;
3351 if (found_key
.offset
== xattr_access
||
3352 found_key
.offset
== xattr_default
)
3357 * we found a key greater than an xattr key, there can't
3358 * be any acls later on
3360 if (found_key
.type
> BTRFS_XATTR_ITEM_KEY
)
3367 * it goes inode, inode backrefs, xattrs, extents,
3368 * so if there are a ton of hard links to an inode there can
3369 * be a lot of backrefs. Don't waste time searching too hard,
3370 * this is just an optimization
3375 /* we hit the end of the leaf before we found an xattr or
3376 * something larger than an xattr. We have to assume the inode
3379 if (*first_xattr_slot
== -1)
3380 *first_xattr_slot
= slot
;
3385 * read an inode from the btree into the in-memory inode
3387 static void btrfs_read_locked_inode(struct inode
*inode
)
3389 struct btrfs_path
*path
;
3390 struct extent_buffer
*leaf
;
3391 struct btrfs_inode_item
*inode_item
;
3392 struct btrfs_timespec
*tspec
;
3393 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3394 struct btrfs_key location
;
3399 bool filled
= false;
3400 int first_xattr_slot
;
3402 ret
= btrfs_fill_inode(inode
, &rdev
);
3406 path
= btrfs_alloc_path();
3410 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
3412 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
3416 leaf
= path
->nodes
[0];
3421 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3422 struct btrfs_inode_item
);
3423 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
3424 set_nlink(inode
, btrfs_inode_nlink(leaf
, inode_item
));
3425 i_uid_write(inode
, btrfs_inode_uid(leaf
, inode_item
));
3426 i_gid_write(inode
, btrfs_inode_gid(leaf
, inode_item
));
3427 btrfs_i_size_write(inode
, btrfs_inode_size(leaf
, inode_item
));
3429 tspec
= btrfs_inode_atime(inode_item
);
3430 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
3431 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
3433 tspec
= btrfs_inode_mtime(inode_item
);
3434 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
3435 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
3437 tspec
= btrfs_inode_ctime(inode_item
);
3438 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
3439 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
3441 inode_set_bytes(inode
, btrfs_inode_nbytes(leaf
, inode_item
));
3442 BTRFS_I(inode
)->generation
= btrfs_inode_generation(leaf
, inode_item
);
3443 BTRFS_I(inode
)->last_trans
= btrfs_inode_transid(leaf
, inode_item
);
3446 * If we were modified in the current generation and evicted from memory
3447 * and then re-read we need to do a full sync since we don't have any
3448 * idea about which extents were modified before we were evicted from
3451 if (BTRFS_I(inode
)->last_trans
== root
->fs_info
->generation
)
3452 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3453 &BTRFS_I(inode
)->runtime_flags
);
3455 inode
->i_version
= btrfs_inode_sequence(leaf
, inode_item
);
3456 inode
->i_generation
= BTRFS_I(inode
)->generation
;
3458 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
3460 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
3461 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
3465 if (inode
->i_nlink
!= 1 ||
3466 path
->slots
[0] >= btrfs_header_nritems(leaf
))
3469 btrfs_item_key_to_cpu(leaf
, &location
, path
->slots
[0]);
3470 if (location
.objectid
!= btrfs_ino(inode
))
3473 ptr
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3474 if (location
.type
== BTRFS_INODE_REF_KEY
) {
3475 struct btrfs_inode_ref
*ref
;
3477 ref
= (struct btrfs_inode_ref
*)ptr
;
3478 BTRFS_I(inode
)->dir_index
= btrfs_inode_ref_index(leaf
, ref
);
3479 } else if (location
.type
== BTRFS_INODE_EXTREF_KEY
) {
3480 struct btrfs_inode_extref
*extref
;
3482 extref
= (struct btrfs_inode_extref
*)ptr
;
3483 BTRFS_I(inode
)->dir_index
= btrfs_inode_extref_index(leaf
,
3488 * try to precache a NULL acl entry for files that don't have
3489 * any xattrs or acls
3491 maybe_acls
= acls_after_inode_item(leaf
, path
->slots
[0],
3492 btrfs_ino(inode
), &first_xattr_slot
);
3493 if (first_xattr_slot
!= -1) {
3494 path
->slots
[0] = first_xattr_slot
;
3495 ret
= btrfs_load_inode_props(inode
, path
);
3497 btrfs_err(root
->fs_info
,
3498 "error loading props for ino %llu (root %llu): %d",
3500 root
->root_key
.objectid
, ret
);
3502 btrfs_free_path(path
);
3505 cache_no_acl(inode
);
3507 switch (inode
->i_mode
& S_IFMT
) {
3509 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3510 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3511 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3512 inode
->i_fop
= &btrfs_file_operations
;
3513 inode
->i_op
= &btrfs_file_inode_operations
;
3516 inode
->i_fop
= &btrfs_dir_file_operations
;
3517 if (root
== root
->fs_info
->tree_root
)
3518 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
3520 inode
->i_op
= &btrfs_dir_inode_operations
;
3523 inode
->i_op
= &btrfs_symlink_inode_operations
;
3524 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
3525 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3528 inode
->i_op
= &btrfs_special_inode_operations
;
3529 init_special_inode(inode
, inode
->i_mode
, rdev
);
3533 btrfs_update_iflags(inode
);
3537 btrfs_free_path(path
);
3538 make_bad_inode(inode
);
3542 * given a leaf and an inode, copy the inode fields into the leaf
3544 static void fill_inode_item(struct btrfs_trans_handle
*trans
,
3545 struct extent_buffer
*leaf
,
3546 struct btrfs_inode_item
*item
,
3547 struct inode
*inode
)
3549 struct btrfs_map_token token
;
3551 btrfs_init_map_token(&token
);
3553 btrfs_set_token_inode_uid(leaf
, item
, i_uid_read(inode
), &token
);
3554 btrfs_set_token_inode_gid(leaf
, item
, i_gid_read(inode
), &token
);
3555 btrfs_set_token_inode_size(leaf
, item
, BTRFS_I(inode
)->disk_i_size
,
3557 btrfs_set_token_inode_mode(leaf
, item
, inode
->i_mode
, &token
);
3558 btrfs_set_token_inode_nlink(leaf
, item
, inode
->i_nlink
, &token
);
3560 btrfs_set_token_timespec_sec(leaf
, btrfs_inode_atime(item
),
3561 inode
->i_atime
.tv_sec
, &token
);
3562 btrfs_set_token_timespec_nsec(leaf
, btrfs_inode_atime(item
),
3563 inode
->i_atime
.tv_nsec
, &token
);
3565 btrfs_set_token_timespec_sec(leaf
, btrfs_inode_mtime(item
),
3566 inode
->i_mtime
.tv_sec
, &token
);
3567 btrfs_set_token_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
3568 inode
->i_mtime
.tv_nsec
, &token
);
3570 btrfs_set_token_timespec_sec(leaf
, btrfs_inode_ctime(item
),
3571 inode
->i_ctime
.tv_sec
, &token
);
3572 btrfs_set_token_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
3573 inode
->i_ctime
.tv_nsec
, &token
);
3575 btrfs_set_token_inode_nbytes(leaf
, item
, inode_get_bytes(inode
),
3577 btrfs_set_token_inode_generation(leaf
, item
, BTRFS_I(inode
)->generation
,
3579 btrfs_set_token_inode_sequence(leaf
, item
, inode
->i_version
, &token
);
3580 btrfs_set_token_inode_transid(leaf
, item
, trans
->transid
, &token
);
3581 btrfs_set_token_inode_rdev(leaf
, item
, inode
->i_rdev
, &token
);
3582 btrfs_set_token_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
, &token
);
3583 btrfs_set_token_inode_block_group(leaf
, item
, 0, &token
);
3587 * copy everything in the in-memory inode into the btree.
3589 static noinline
int btrfs_update_inode_item(struct btrfs_trans_handle
*trans
,
3590 struct btrfs_root
*root
, struct inode
*inode
)
3592 struct btrfs_inode_item
*inode_item
;
3593 struct btrfs_path
*path
;
3594 struct extent_buffer
*leaf
;
3597 path
= btrfs_alloc_path();
3601 path
->leave_spinning
= 1;
3602 ret
= btrfs_lookup_inode(trans
, root
, path
, &BTRFS_I(inode
)->location
,
3610 leaf
= path
->nodes
[0];
3611 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3612 struct btrfs_inode_item
);
3614 fill_inode_item(trans
, leaf
, inode_item
, inode
);
3615 btrfs_mark_buffer_dirty(leaf
);
3616 btrfs_set_inode_last_trans(trans
, inode
);
3619 btrfs_free_path(path
);
3624 * copy everything in the in-memory inode into the btree.
3626 noinline
int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
3627 struct btrfs_root
*root
, struct inode
*inode
)
3632 * If the inode is a free space inode, we can deadlock during commit
3633 * if we put it into the delayed code.
3635 * The data relocation inode should also be directly updated
3638 if (!btrfs_is_free_space_inode(inode
)
3639 && root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
) {
3640 btrfs_update_root_times(trans
, root
);
3642 ret
= btrfs_delayed_update_inode(trans
, root
, inode
);
3644 btrfs_set_inode_last_trans(trans
, inode
);
3648 return btrfs_update_inode_item(trans
, root
, inode
);
3651 noinline
int btrfs_update_inode_fallback(struct btrfs_trans_handle
*trans
,
3652 struct btrfs_root
*root
,
3653 struct inode
*inode
)
3657 ret
= btrfs_update_inode(trans
, root
, inode
);
3659 return btrfs_update_inode_item(trans
, root
, inode
);
3664 * unlink helper that gets used here in inode.c and in the tree logging
3665 * recovery code. It remove a link in a directory with a given name, and
3666 * also drops the back refs in the inode to the directory
3668 static int __btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3669 struct btrfs_root
*root
,
3670 struct inode
*dir
, struct inode
*inode
,
3671 const char *name
, int name_len
)
3673 struct btrfs_path
*path
;
3675 struct extent_buffer
*leaf
;
3676 struct btrfs_dir_item
*di
;
3677 struct btrfs_key key
;
3679 u64 ino
= btrfs_ino(inode
);
3680 u64 dir_ino
= btrfs_ino(dir
);
3682 path
= btrfs_alloc_path();
3688 path
->leave_spinning
= 1;
3689 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
3690 name
, name_len
, -1);
3699 leaf
= path
->nodes
[0];
3700 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
3701 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
3704 btrfs_release_path(path
);
3707 * If we don't have dir index, we have to get it by looking up
3708 * the inode ref, since we get the inode ref, remove it directly,
3709 * it is unnecessary to do delayed deletion.
3711 * But if we have dir index, needn't search inode ref to get it.
3712 * Since the inode ref is close to the inode item, it is better
3713 * that we delay to delete it, and just do this deletion when
3714 * we update the inode item.
3716 if (BTRFS_I(inode
)->dir_index
) {
3717 ret
= btrfs_delayed_delete_inode_ref(inode
);
3719 index
= BTRFS_I(inode
)->dir_index
;
3724 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
, ino
,
3727 btrfs_info(root
->fs_info
,
3728 "failed to delete reference to %.*s, inode %llu parent %llu",
3729 name_len
, name
, ino
, dir_ino
);
3730 btrfs_abort_transaction(trans
, root
, ret
);
3734 ret
= btrfs_delete_delayed_dir_index(trans
, root
, dir
, index
);
3736 btrfs_abort_transaction(trans
, root
, ret
);
3740 ret
= btrfs_del_inode_ref_in_log(trans
, root
, name
, name_len
,
3742 if (ret
!= 0 && ret
!= -ENOENT
) {
3743 btrfs_abort_transaction(trans
, root
, ret
);
3747 ret
= btrfs_del_dir_entries_in_log(trans
, root
, name
, name_len
,
3752 btrfs_abort_transaction(trans
, root
, ret
);
3754 btrfs_free_path(path
);
3758 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
3759 inode_inc_iversion(inode
);
3760 inode_inc_iversion(dir
);
3761 inode
->i_ctime
= dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
3762 ret
= btrfs_update_inode(trans
, root
, dir
);
3767 int btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3768 struct btrfs_root
*root
,
3769 struct inode
*dir
, struct inode
*inode
,
3770 const char *name
, int name_len
)
3773 ret
= __btrfs_unlink_inode(trans
, root
, dir
, inode
, name
, name_len
);
3776 ret
= btrfs_update_inode(trans
, root
, inode
);
3782 * helper to start transaction for unlink and rmdir.
3784 * unlink and rmdir are special in btrfs, they do not always free space, so
3785 * if we cannot make our reservations the normal way try and see if there is
3786 * plenty of slack room in the global reserve to migrate, otherwise we cannot
3787 * allow the unlink to occur.
3789 static struct btrfs_trans_handle
*__unlink_start_trans(struct inode
*dir
)
3791 struct btrfs_trans_handle
*trans
;
3792 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3796 * 1 for the possible orphan item
3797 * 1 for the dir item
3798 * 1 for the dir index
3799 * 1 for the inode ref
3802 trans
= btrfs_start_transaction(root
, 5);
3803 if (!IS_ERR(trans
) || PTR_ERR(trans
) != -ENOSPC
)
3806 if (PTR_ERR(trans
) == -ENOSPC
) {
3807 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 5);
3809 trans
= btrfs_start_transaction(root
, 0);
3812 ret
= btrfs_cond_migrate_bytes(root
->fs_info
,
3813 &root
->fs_info
->trans_block_rsv
,
3816 btrfs_end_transaction(trans
, root
);
3817 return ERR_PTR(ret
);
3819 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
3820 trans
->bytes_reserved
= num_bytes
;
3825 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
3827 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3828 struct btrfs_trans_handle
*trans
;
3829 struct inode
*inode
= dentry
->d_inode
;
3832 trans
= __unlink_start_trans(dir
);
3834 return PTR_ERR(trans
);
3836 btrfs_record_unlink_dir(trans
, dir
, dentry
->d_inode
, 0);
3838 ret
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
3839 dentry
->d_name
.name
, dentry
->d_name
.len
);
3843 if (inode
->i_nlink
== 0) {
3844 ret
= btrfs_orphan_add(trans
, inode
);
3850 btrfs_end_transaction(trans
, root
);
3851 btrfs_btree_balance_dirty(root
);
3855 int btrfs_unlink_subvol(struct btrfs_trans_handle
*trans
,
3856 struct btrfs_root
*root
,
3857 struct inode
*dir
, u64 objectid
,
3858 const char *name
, int name_len
)
3860 struct btrfs_path
*path
;
3861 struct extent_buffer
*leaf
;
3862 struct btrfs_dir_item
*di
;
3863 struct btrfs_key key
;
3866 u64 dir_ino
= btrfs_ino(dir
);
3868 path
= btrfs_alloc_path();
3872 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
3873 name
, name_len
, -1);
3874 if (IS_ERR_OR_NULL(di
)) {
3882 leaf
= path
->nodes
[0];
3883 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
3884 WARN_ON(key
.type
!= BTRFS_ROOT_ITEM_KEY
|| key
.objectid
!= objectid
);
3885 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
3887 btrfs_abort_transaction(trans
, root
, ret
);
3890 btrfs_release_path(path
);
3892 ret
= btrfs_del_root_ref(trans
, root
->fs_info
->tree_root
,
3893 objectid
, root
->root_key
.objectid
,
3894 dir_ino
, &index
, name
, name_len
);
3896 if (ret
!= -ENOENT
) {
3897 btrfs_abort_transaction(trans
, root
, ret
);
3900 di
= btrfs_search_dir_index_item(root
, path
, dir_ino
,
3902 if (IS_ERR_OR_NULL(di
)) {
3907 btrfs_abort_transaction(trans
, root
, ret
);
3911 leaf
= path
->nodes
[0];
3912 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
3913 btrfs_release_path(path
);
3916 btrfs_release_path(path
);
3918 ret
= btrfs_delete_delayed_dir_index(trans
, root
, dir
, index
);
3920 btrfs_abort_transaction(trans
, root
, ret
);
3924 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
3925 inode_inc_iversion(dir
);
3926 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
3927 ret
= btrfs_update_inode_fallback(trans
, root
, dir
);
3929 btrfs_abort_transaction(trans
, root
, ret
);
3931 btrfs_free_path(path
);
3935 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
3937 struct inode
*inode
= dentry
->d_inode
;
3939 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3940 struct btrfs_trans_handle
*trans
;
3942 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
3944 if (btrfs_ino(inode
) == BTRFS_FIRST_FREE_OBJECTID
)
3947 trans
= __unlink_start_trans(dir
);
3949 return PTR_ERR(trans
);
3951 if (unlikely(btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
3952 err
= btrfs_unlink_subvol(trans
, root
, dir
,
3953 BTRFS_I(inode
)->location
.objectid
,
3954 dentry
->d_name
.name
,
3955 dentry
->d_name
.len
);
3959 err
= btrfs_orphan_add(trans
, inode
);
3963 /* now the directory is empty */
3964 err
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
3965 dentry
->d_name
.name
, dentry
->d_name
.len
);
3967 btrfs_i_size_write(inode
, 0);
3969 btrfs_end_transaction(trans
, root
);
3970 btrfs_btree_balance_dirty(root
);
3976 * this can truncate away extent items, csum items and directory items.
3977 * It starts at a high offset and removes keys until it can't find
3978 * any higher than new_size
3980 * csum items that cross the new i_size are truncated to the new size
3983 * min_type is the minimum key type to truncate down to. If set to 0, this
3984 * will kill all the items on this inode, including the INODE_ITEM_KEY.
3986 int btrfs_truncate_inode_items(struct btrfs_trans_handle
*trans
,
3987 struct btrfs_root
*root
,
3988 struct inode
*inode
,
3989 u64 new_size
, u32 min_type
)
3991 struct btrfs_path
*path
;
3992 struct extent_buffer
*leaf
;
3993 struct btrfs_file_extent_item
*fi
;
3994 struct btrfs_key key
;
3995 struct btrfs_key found_key
;
3996 u64 extent_start
= 0;
3997 u64 extent_num_bytes
= 0;
3998 u64 extent_offset
= 0;
4000 u64 last_size
= (u64
)-1;
4001 u32 found_type
= (u8
)-1;
4004 int pending_del_nr
= 0;
4005 int pending_del_slot
= 0;
4006 int extent_type
= -1;
4009 u64 ino
= btrfs_ino(inode
);
4011 BUG_ON(new_size
> 0 && min_type
!= BTRFS_EXTENT_DATA_KEY
);
4013 path
= btrfs_alloc_path();
4019 * We want to drop from the next block forward in case this new size is
4020 * not block aligned since we will be keeping the last block of the
4021 * extent just the way it is.
4023 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
4024 root
== root
->fs_info
->tree_root
)
4025 btrfs_drop_extent_cache(inode
, ALIGN(new_size
,
4026 root
->sectorsize
), (u64
)-1, 0);
4029 * This function is also used to drop the items in the log tree before
4030 * we relog the inode, so if root != BTRFS_I(inode)->root, it means
4031 * it is used to drop the loged items. So we shouldn't kill the delayed
4034 if (min_type
== 0 && root
== BTRFS_I(inode
)->root
)
4035 btrfs_kill_delayed_inode_items(inode
);
4038 key
.offset
= (u64
)-1;
4042 path
->leave_spinning
= 1;
4043 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
4050 /* there are no items in the tree for us to truncate, we're
4053 if (path
->slots
[0] == 0)
4060 leaf
= path
->nodes
[0];
4061 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
4062 found_type
= btrfs_key_type(&found_key
);
4064 if (found_key
.objectid
!= ino
)
4067 if (found_type
< min_type
)
4070 item_end
= found_key
.offset
;
4071 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
4072 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
4073 struct btrfs_file_extent_item
);
4074 extent_type
= btrfs_file_extent_type(leaf
, fi
);
4075 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4077 btrfs_file_extent_num_bytes(leaf
, fi
);
4078 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4079 item_end
+= btrfs_file_extent_inline_len(leaf
,
4080 path
->slots
[0], fi
);
4084 if (found_type
> min_type
) {
4087 if (item_end
< new_size
)
4089 if (found_key
.offset
>= new_size
)
4095 /* FIXME, shrink the extent if the ref count is only 1 */
4096 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
4100 last_size
= found_key
.offset
;
4102 last_size
= new_size
;
4104 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4106 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
4108 u64 orig_num_bytes
=
4109 btrfs_file_extent_num_bytes(leaf
, fi
);
4110 extent_num_bytes
= ALIGN(new_size
-
4113 btrfs_set_file_extent_num_bytes(leaf
, fi
,
4115 num_dec
= (orig_num_bytes
-
4117 if (test_bit(BTRFS_ROOT_REF_COWS
,
4120 inode_sub_bytes(inode
, num_dec
);
4121 btrfs_mark_buffer_dirty(leaf
);
4124 btrfs_file_extent_disk_num_bytes(leaf
,
4126 extent_offset
= found_key
.offset
-
4127 btrfs_file_extent_offset(leaf
, fi
);
4129 /* FIXME blocksize != 4096 */
4130 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
4131 if (extent_start
!= 0) {
4133 if (test_bit(BTRFS_ROOT_REF_COWS
,
4135 inode_sub_bytes(inode
, num_dec
);
4138 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4140 * we can't truncate inline items that have had
4144 btrfs_file_extent_compression(leaf
, fi
) == 0 &&
4145 btrfs_file_extent_encryption(leaf
, fi
) == 0 &&
4146 btrfs_file_extent_other_encoding(leaf
, fi
) == 0) {
4147 u32 size
= new_size
- found_key
.offset
;
4149 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
4150 inode_sub_bytes(inode
, item_end
+ 1 -
4154 * update the ram bytes to properly reflect
4155 * the new size of our item
4157 btrfs_set_file_extent_ram_bytes(leaf
, fi
, size
);
4159 btrfs_file_extent_calc_inline_size(size
);
4160 btrfs_truncate_item(root
, path
, size
, 1);
4161 } else if (test_bit(BTRFS_ROOT_REF_COWS
,
4163 inode_sub_bytes(inode
, item_end
+ 1 -
4169 if (!pending_del_nr
) {
4170 /* no pending yet, add ourselves */
4171 pending_del_slot
= path
->slots
[0];
4173 } else if (pending_del_nr
&&
4174 path
->slots
[0] + 1 == pending_del_slot
) {
4175 /* hop on the pending chunk */
4177 pending_del_slot
= path
->slots
[0];
4185 (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
4186 root
== root
->fs_info
->tree_root
)) {
4187 btrfs_set_path_blocking(path
);
4188 ret
= btrfs_free_extent(trans
, root
, extent_start
,
4189 extent_num_bytes
, 0,
4190 btrfs_header_owner(leaf
),
4191 ino
, extent_offset
, 0);
4195 if (found_type
== BTRFS_INODE_ITEM_KEY
)
4198 if (path
->slots
[0] == 0 ||
4199 path
->slots
[0] != pending_del_slot
) {
4200 if (pending_del_nr
) {
4201 ret
= btrfs_del_items(trans
, root
, path
,
4205 btrfs_abort_transaction(trans
,
4211 btrfs_release_path(path
);
4218 if (pending_del_nr
) {
4219 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
4222 btrfs_abort_transaction(trans
, root
, ret
);
4225 if (last_size
!= (u64
)-1)
4226 btrfs_ordered_update_i_size(inode
, last_size
, NULL
);
4227 btrfs_free_path(path
);
4232 * btrfs_truncate_page - read, zero a chunk and write a page
4233 * @inode - inode that we're zeroing
4234 * @from - the offset to start zeroing
4235 * @len - the length to zero, 0 to zero the entire range respective to the
4237 * @front - zero up to the offset instead of from the offset on
4239 * This will find the page for the "from" offset and cow the page and zero the
4240 * part we want to zero. This is used with truncate and hole punching.
4242 int btrfs_truncate_page(struct inode
*inode
, loff_t from
, loff_t len
,
4245 struct address_space
*mapping
= inode
->i_mapping
;
4246 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4247 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4248 struct btrfs_ordered_extent
*ordered
;
4249 struct extent_state
*cached_state
= NULL
;
4251 u32 blocksize
= root
->sectorsize
;
4252 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
4253 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
4255 gfp_t mask
= btrfs_alloc_write_mask(mapping
);
4260 if ((offset
& (blocksize
- 1)) == 0 &&
4261 (!len
|| ((len
& (blocksize
- 1)) == 0)))
4263 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
4268 page
= find_or_create_page(mapping
, index
, mask
);
4270 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
4275 page_start
= page_offset(page
);
4276 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
4278 if (!PageUptodate(page
)) {
4279 ret
= btrfs_readpage(NULL
, page
);
4281 if (page
->mapping
!= mapping
) {
4283 page_cache_release(page
);
4286 if (!PageUptodate(page
)) {
4291 wait_on_page_writeback(page
);
4293 lock_extent_bits(io_tree
, page_start
, page_end
, 0, &cached_state
);
4294 set_page_extent_mapped(page
);
4296 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
4298 unlock_extent_cached(io_tree
, page_start
, page_end
,
4299 &cached_state
, GFP_NOFS
);
4301 page_cache_release(page
);
4302 btrfs_start_ordered_extent(inode
, ordered
, 1);
4303 btrfs_put_ordered_extent(ordered
);
4307 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
4308 EXTENT_DIRTY
| EXTENT_DELALLOC
|
4309 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
,
4310 0, 0, &cached_state
, GFP_NOFS
);
4312 ret
= btrfs_set_extent_delalloc(inode
, page_start
, page_end
,
4315 unlock_extent_cached(io_tree
, page_start
, page_end
,
4316 &cached_state
, GFP_NOFS
);
4320 if (offset
!= PAGE_CACHE_SIZE
) {
4322 len
= PAGE_CACHE_SIZE
- offset
;
4325 memset(kaddr
, 0, offset
);
4327 memset(kaddr
+ offset
, 0, len
);
4328 flush_dcache_page(page
);
4331 ClearPageChecked(page
);
4332 set_page_dirty(page
);
4333 unlock_extent_cached(io_tree
, page_start
, page_end
, &cached_state
,
4338 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
4340 page_cache_release(page
);
4345 static int maybe_insert_hole(struct btrfs_root
*root
, struct inode
*inode
,
4346 u64 offset
, u64 len
)
4348 struct btrfs_trans_handle
*trans
;
4352 * Still need to make sure the inode looks like it's been updated so
4353 * that any holes get logged if we fsync.
4355 if (btrfs_fs_incompat(root
->fs_info
, NO_HOLES
)) {
4356 BTRFS_I(inode
)->last_trans
= root
->fs_info
->generation
;
4357 BTRFS_I(inode
)->last_sub_trans
= root
->log_transid
;
4358 BTRFS_I(inode
)->last_log_commit
= root
->last_log_commit
;
4363 * 1 - for the one we're dropping
4364 * 1 - for the one we're adding
4365 * 1 - for updating the inode.
4367 trans
= btrfs_start_transaction(root
, 3);
4369 return PTR_ERR(trans
);
4371 ret
= btrfs_drop_extents(trans
, root
, inode
, offset
, offset
+ len
, 1);
4373 btrfs_abort_transaction(trans
, root
, ret
);
4374 btrfs_end_transaction(trans
, root
);
4378 ret
= btrfs_insert_file_extent(trans
, root
, btrfs_ino(inode
), offset
,
4379 0, 0, len
, 0, len
, 0, 0, 0);
4381 btrfs_abort_transaction(trans
, root
, ret
);
4383 btrfs_update_inode(trans
, root
, inode
);
4384 btrfs_end_transaction(trans
, root
);
4389 * This function puts in dummy file extents for the area we're creating a hole
4390 * for. So if we are truncating this file to a larger size we need to insert
4391 * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
4392 * the range between oldsize and size
4394 int btrfs_cont_expand(struct inode
*inode
, loff_t oldsize
, loff_t size
)
4396 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4397 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4398 struct extent_map
*em
= NULL
;
4399 struct extent_state
*cached_state
= NULL
;
4400 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
4401 u64 hole_start
= ALIGN(oldsize
, root
->sectorsize
);
4402 u64 block_end
= ALIGN(size
, root
->sectorsize
);
4409 * If our size started in the middle of a page we need to zero out the
4410 * rest of the page before we expand the i_size, otherwise we could
4411 * expose stale data.
4413 err
= btrfs_truncate_page(inode
, oldsize
, 0, 0);
4417 if (size
<= hole_start
)
4421 struct btrfs_ordered_extent
*ordered
;
4423 lock_extent_bits(io_tree
, hole_start
, block_end
- 1, 0,
4425 ordered
= btrfs_lookup_ordered_range(inode
, hole_start
,
4426 block_end
- hole_start
);
4429 unlock_extent_cached(io_tree
, hole_start
, block_end
- 1,
4430 &cached_state
, GFP_NOFS
);
4431 btrfs_start_ordered_extent(inode
, ordered
, 1);
4432 btrfs_put_ordered_extent(ordered
);
4435 cur_offset
= hole_start
;
4437 em
= btrfs_get_extent(inode
, NULL
, 0, cur_offset
,
4438 block_end
- cur_offset
, 0);
4444 last_byte
= min(extent_map_end(em
), block_end
);
4445 last_byte
= ALIGN(last_byte
, root
->sectorsize
);
4446 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
)) {
4447 struct extent_map
*hole_em
;
4448 hole_size
= last_byte
- cur_offset
;
4450 err
= maybe_insert_hole(root
, inode
, cur_offset
,
4454 btrfs_drop_extent_cache(inode
, cur_offset
,
4455 cur_offset
+ hole_size
- 1, 0);
4456 hole_em
= alloc_extent_map();
4458 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
4459 &BTRFS_I(inode
)->runtime_flags
);
4462 hole_em
->start
= cur_offset
;
4463 hole_em
->len
= hole_size
;
4464 hole_em
->orig_start
= cur_offset
;
4466 hole_em
->block_start
= EXTENT_MAP_HOLE
;
4467 hole_em
->block_len
= 0;
4468 hole_em
->orig_block_len
= 0;
4469 hole_em
->ram_bytes
= hole_size
;
4470 hole_em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
4471 hole_em
->compress_type
= BTRFS_COMPRESS_NONE
;
4472 hole_em
->generation
= root
->fs_info
->generation
;
4475 write_lock(&em_tree
->lock
);
4476 err
= add_extent_mapping(em_tree
, hole_em
, 1);
4477 write_unlock(&em_tree
->lock
);
4480 btrfs_drop_extent_cache(inode
, cur_offset
,
4484 free_extent_map(hole_em
);
4487 free_extent_map(em
);
4489 cur_offset
= last_byte
;
4490 if (cur_offset
>= block_end
)
4493 free_extent_map(em
);
4494 unlock_extent_cached(io_tree
, hole_start
, block_end
- 1, &cached_state
,
4499 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
)
4501 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4502 struct btrfs_trans_handle
*trans
;
4503 loff_t oldsize
= i_size_read(inode
);
4504 loff_t newsize
= attr
->ia_size
;
4505 int mask
= attr
->ia_valid
;
4509 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
4510 * special case where we need to update the times despite not having
4511 * these flags set. For all other operations the VFS set these flags
4512 * explicitly if it wants a timestamp update.
4514 if (newsize
!= oldsize
) {
4515 inode_inc_iversion(inode
);
4516 if (!(mask
& (ATTR_CTIME
| ATTR_MTIME
)))
4517 inode
->i_ctime
= inode
->i_mtime
=
4518 current_fs_time(inode
->i_sb
);
4521 if (newsize
> oldsize
) {
4522 truncate_pagecache(inode
, newsize
);
4523 ret
= btrfs_cont_expand(inode
, oldsize
, newsize
);
4527 trans
= btrfs_start_transaction(root
, 1);
4529 return PTR_ERR(trans
);
4531 i_size_write(inode
, newsize
);
4532 btrfs_ordered_update_i_size(inode
, i_size_read(inode
), NULL
);
4533 ret
= btrfs_update_inode(trans
, root
, inode
);
4534 btrfs_end_transaction(trans
, root
);
4538 * We're truncating a file that used to have good data down to
4539 * zero. Make sure it gets into the ordered flush list so that
4540 * any new writes get down to disk quickly.
4543 set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE
,
4544 &BTRFS_I(inode
)->runtime_flags
);
4547 * 1 for the orphan item we're going to add
4548 * 1 for the orphan item deletion.
4550 trans
= btrfs_start_transaction(root
, 2);
4552 return PTR_ERR(trans
);
4555 * We need to do this in case we fail at _any_ point during the
4556 * actual truncate. Once we do the truncate_setsize we could
4557 * invalidate pages which forces any outstanding ordered io to
4558 * be instantly completed which will give us extents that need
4559 * to be truncated. If we fail to get an orphan inode down we
4560 * could have left over extents that were never meant to live,
4561 * so we need to garuntee from this point on that everything
4562 * will be consistent.
4564 ret
= btrfs_orphan_add(trans
, inode
);
4565 btrfs_end_transaction(trans
, root
);
4569 /* we don't support swapfiles, so vmtruncate shouldn't fail */
4570 truncate_setsize(inode
, newsize
);
4572 /* Disable nonlocked read DIO to avoid the end less truncate */
4573 btrfs_inode_block_unlocked_dio(inode
);
4574 inode_dio_wait(inode
);
4575 btrfs_inode_resume_unlocked_dio(inode
);
4577 ret
= btrfs_truncate(inode
);
4578 if (ret
&& inode
->i_nlink
) {
4582 * failed to truncate, disk_i_size is only adjusted down
4583 * as we remove extents, so it should represent the true
4584 * size of the inode, so reset the in memory size and
4585 * delete our orphan entry.
4587 trans
= btrfs_join_transaction(root
);
4588 if (IS_ERR(trans
)) {
4589 btrfs_orphan_del(NULL
, inode
);
4592 i_size_write(inode
, BTRFS_I(inode
)->disk_i_size
);
4593 err
= btrfs_orphan_del(trans
, inode
);
4595 btrfs_abort_transaction(trans
, root
, err
);
4596 btrfs_end_transaction(trans
, root
);
4603 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
4605 struct inode
*inode
= dentry
->d_inode
;
4606 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4609 if (btrfs_root_readonly(root
))
4612 err
= inode_change_ok(inode
, attr
);
4616 if (S_ISREG(inode
->i_mode
) && (attr
->ia_valid
& ATTR_SIZE
)) {
4617 err
= btrfs_setsize(inode
, attr
);
4622 if (attr
->ia_valid
) {
4623 setattr_copy(inode
, attr
);
4624 inode_inc_iversion(inode
);
4625 err
= btrfs_dirty_inode(inode
);
4627 if (!err
&& attr
->ia_valid
& ATTR_MODE
)
4628 err
= posix_acl_chmod(inode
, inode
->i_mode
);
4635 * While truncating the inode pages during eviction, we get the VFS calling
4636 * btrfs_invalidatepage() against each page of the inode. This is slow because
4637 * the calls to btrfs_invalidatepage() result in a huge amount of calls to
4638 * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting
4639 * extent_state structures over and over, wasting lots of time.
4641 * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all
4642 * those expensive operations on a per page basis and do only the ordered io
4643 * finishing, while we release here the extent_map and extent_state structures,
4644 * without the excessive merging and splitting.
4646 static void evict_inode_truncate_pages(struct inode
*inode
)
4648 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4649 struct extent_map_tree
*map_tree
= &BTRFS_I(inode
)->extent_tree
;
4650 struct rb_node
*node
;
4652 ASSERT(inode
->i_state
& I_FREEING
);
4653 truncate_inode_pages_final(&inode
->i_data
);
4655 write_lock(&map_tree
->lock
);
4656 while (!RB_EMPTY_ROOT(&map_tree
->map
)) {
4657 struct extent_map
*em
;
4659 node
= rb_first(&map_tree
->map
);
4660 em
= rb_entry(node
, struct extent_map
, rb_node
);
4661 clear_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
4662 clear_bit(EXTENT_FLAG_LOGGING
, &em
->flags
);
4663 remove_extent_mapping(map_tree
, em
);
4664 free_extent_map(em
);
4666 write_unlock(&map_tree
->lock
);
4668 spin_lock(&io_tree
->lock
);
4669 while (!RB_EMPTY_ROOT(&io_tree
->state
)) {
4670 struct extent_state
*state
;
4671 struct extent_state
*cached_state
= NULL
;
4673 node
= rb_first(&io_tree
->state
);
4674 state
= rb_entry(node
, struct extent_state
, rb_node
);
4675 atomic_inc(&state
->refs
);
4676 spin_unlock(&io_tree
->lock
);
4678 lock_extent_bits(io_tree
, state
->start
, state
->end
,
4680 clear_extent_bit(io_tree
, state
->start
, state
->end
,
4681 EXTENT_LOCKED
| EXTENT_DIRTY
|
4682 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
4683 EXTENT_DEFRAG
, 1, 1,
4684 &cached_state
, GFP_NOFS
);
4685 free_extent_state(state
);
4687 spin_lock(&io_tree
->lock
);
4689 spin_unlock(&io_tree
->lock
);
4692 void btrfs_evict_inode(struct inode
*inode
)
4694 struct btrfs_trans_handle
*trans
;
4695 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4696 struct btrfs_block_rsv
*rsv
, *global_rsv
;
4697 u64 min_size
= btrfs_calc_trunc_metadata_size(root
, 1);
4700 trace_btrfs_inode_evict(inode
);
4702 evict_inode_truncate_pages(inode
);
4704 if (inode
->i_nlink
&&
4705 ((btrfs_root_refs(&root
->root_item
) != 0 &&
4706 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
) ||
4707 btrfs_is_free_space_inode(inode
)))
4710 if (is_bad_inode(inode
)) {
4711 btrfs_orphan_del(NULL
, inode
);
4714 /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */
4715 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
4717 if (root
->fs_info
->log_root_recovering
) {
4718 BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
4719 &BTRFS_I(inode
)->runtime_flags
));
4723 if (inode
->i_nlink
> 0) {
4724 BUG_ON(btrfs_root_refs(&root
->root_item
) != 0 &&
4725 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
);
4729 ret
= btrfs_commit_inode_delayed_inode(inode
);
4731 btrfs_orphan_del(NULL
, inode
);
4735 rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
4737 btrfs_orphan_del(NULL
, inode
);
4740 rsv
->size
= min_size
;
4742 global_rsv
= &root
->fs_info
->global_block_rsv
;
4744 btrfs_i_size_write(inode
, 0);
4747 * This is a bit simpler than btrfs_truncate since we've already
4748 * reserved our space for our orphan item in the unlink, so we just
4749 * need to reserve some slack space in case we add bytes and update
4750 * inode item when doing the truncate.
4753 ret
= btrfs_block_rsv_refill(root
, rsv
, min_size
,
4754 BTRFS_RESERVE_FLUSH_LIMIT
);
4757 * Try and steal from the global reserve since we will
4758 * likely not use this space anyway, we want to try as
4759 * hard as possible to get this to work.
4762 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
, min_size
);
4765 btrfs_warn(root
->fs_info
,
4766 "Could not get space for a delete, will truncate on mount %d",
4768 btrfs_orphan_del(NULL
, inode
);
4769 btrfs_free_block_rsv(root
, rsv
);
4773 trans
= btrfs_join_transaction(root
);
4774 if (IS_ERR(trans
)) {
4775 btrfs_orphan_del(NULL
, inode
);
4776 btrfs_free_block_rsv(root
, rsv
);
4780 trans
->block_rsv
= rsv
;
4782 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, 0, 0);
4786 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
4787 btrfs_end_transaction(trans
, root
);
4789 btrfs_btree_balance_dirty(root
);
4792 btrfs_free_block_rsv(root
, rsv
);
4795 * Errors here aren't a big deal, it just means we leave orphan items
4796 * in the tree. They will be cleaned up on the next mount.
4799 trans
->block_rsv
= root
->orphan_block_rsv
;
4800 btrfs_orphan_del(trans
, inode
);
4802 btrfs_orphan_del(NULL
, inode
);
4805 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
4806 if (!(root
== root
->fs_info
->tree_root
||
4807 root
->root_key
.objectid
== BTRFS_TREE_RELOC_OBJECTID
))
4808 btrfs_return_ino(root
, btrfs_ino(inode
));
4810 btrfs_end_transaction(trans
, root
);
4811 btrfs_btree_balance_dirty(root
);
4813 btrfs_remove_delayed_node(inode
);
4819 * this returns the key found in the dir entry in the location pointer.
4820 * If no dir entries were found, location->objectid is 0.
4822 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
4823 struct btrfs_key
*location
)
4825 const char *name
= dentry
->d_name
.name
;
4826 int namelen
= dentry
->d_name
.len
;
4827 struct btrfs_dir_item
*di
;
4828 struct btrfs_path
*path
;
4829 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
4832 path
= btrfs_alloc_path();
4836 di
= btrfs_lookup_dir_item(NULL
, root
, path
, btrfs_ino(dir
), name
,
4841 if (IS_ERR_OR_NULL(di
))
4844 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
4846 btrfs_free_path(path
);
4849 location
->objectid
= 0;
4854 * when we hit a tree root in a directory, the btrfs part of the inode
4855 * needs to be changed to reflect the root directory of the tree root. This
4856 * is kind of like crossing a mount point.
4858 static int fixup_tree_root_location(struct btrfs_root
*root
,
4860 struct dentry
*dentry
,
4861 struct btrfs_key
*location
,
4862 struct btrfs_root
**sub_root
)
4864 struct btrfs_path
*path
;
4865 struct btrfs_root
*new_root
;
4866 struct btrfs_root_ref
*ref
;
4867 struct extent_buffer
*leaf
;
4871 path
= btrfs_alloc_path();
4878 ret
= btrfs_find_item(root
->fs_info
->tree_root
, path
,
4879 BTRFS_I(dir
)->root
->root_key
.objectid
,
4880 location
->objectid
, BTRFS_ROOT_REF_KEY
, NULL
);
4887 leaf
= path
->nodes
[0];
4888 ref
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_root_ref
);
4889 if (btrfs_root_ref_dirid(leaf
, ref
) != btrfs_ino(dir
) ||
4890 btrfs_root_ref_name_len(leaf
, ref
) != dentry
->d_name
.len
)
4893 ret
= memcmp_extent_buffer(leaf
, dentry
->d_name
.name
,
4894 (unsigned long)(ref
+ 1),
4895 dentry
->d_name
.len
);
4899 btrfs_release_path(path
);
4901 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, location
);
4902 if (IS_ERR(new_root
)) {
4903 err
= PTR_ERR(new_root
);
4907 *sub_root
= new_root
;
4908 location
->objectid
= btrfs_root_dirid(&new_root
->root_item
);
4909 location
->type
= BTRFS_INODE_ITEM_KEY
;
4910 location
->offset
= 0;
4913 btrfs_free_path(path
);
4917 static void inode_tree_add(struct inode
*inode
)
4919 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4920 struct btrfs_inode
*entry
;
4922 struct rb_node
*parent
;
4923 struct rb_node
*new = &BTRFS_I(inode
)->rb_node
;
4924 u64 ino
= btrfs_ino(inode
);
4926 if (inode_unhashed(inode
))
4929 spin_lock(&root
->inode_lock
);
4930 p
= &root
->inode_tree
.rb_node
;
4933 entry
= rb_entry(parent
, struct btrfs_inode
, rb_node
);
4935 if (ino
< btrfs_ino(&entry
->vfs_inode
))
4936 p
= &parent
->rb_left
;
4937 else if (ino
> btrfs_ino(&entry
->vfs_inode
))
4938 p
= &parent
->rb_right
;
4940 WARN_ON(!(entry
->vfs_inode
.i_state
&
4941 (I_WILL_FREE
| I_FREEING
)));
4942 rb_replace_node(parent
, new, &root
->inode_tree
);
4943 RB_CLEAR_NODE(parent
);
4944 spin_unlock(&root
->inode_lock
);
4948 rb_link_node(new, parent
, p
);
4949 rb_insert_color(new, &root
->inode_tree
);
4950 spin_unlock(&root
->inode_lock
);
4953 static void inode_tree_del(struct inode
*inode
)
4955 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4958 spin_lock(&root
->inode_lock
);
4959 if (!RB_EMPTY_NODE(&BTRFS_I(inode
)->rb_node
)) {
4960 rb_erase(&BTRFS_I(inode
)->rb_node
, &root
->inode_tree
);
4961 RB_CLEAR_NODE(&BTRFS_I(inode
)->rb_node
);
4962 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
4964 spin_unlock(&root
->inode_lock
);
4966 if (empty
&& btrfs_root_refs(&root
->root_item
) == 0) {
4967 synchronize_srcu(&root
->fs_info
->subvol_srcu
);
4968 spin_lock(&root
->inode_lock
);
4969 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
4970 spin_unlock(&root
->inode_lock
);
4972 btrfs_add_dead_root(root
);
4976 void btrfs_invalidate_inodes(struct btrfs_root
*root
)
4978 struct rb_node
*node
;
4979 struct rb_node
*prev
;
4980 struct btrfs_inode
*entry
;
4981 struct inode
*inode
;
4984 if (!test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
4985 WARN_ON(btrfs_root_refs(&root
->root_item
) != 0);
4987 spin_lock(&root
->inode_lock
);
4989 node
= root
->inode_tree
.rb_node
;
4993 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
4995 if (objectid
< btrfs_ino(&entry
->vfs_inode
))
4996 node
= node
->rb_left
;
4997 else if (objectid
> btrfs_ino(&entry
->vfs_inode
))
4998 node
= node
->rb_right
;
5004 entry
= rb_entry(prev
, struct btrfs_inode
, rb_node
);
5005 if (objectid
<= btrfs_ino(&entry
->vfs_inode
)) {
5009 prev
= rb_next(prev
);
5013 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
5014 objectid
= btrfs_ino(&entry
->vfs_inode
) + 1;
5015 inode
= igrab(&entry
->vfs_inode
);
5017 spin_unlock(&root
->inode_lock
);
5018 if (atomic_read(&inode
->i_count
) > 1)
5019 d_prune_aliases(inode
);
5021 * btrfs_drop_inode will have it removed from
5022 * the inode cache when its usage count
5027 spin_lock(&root
->inode_lock
);
5031 if (cond_resched_lock(&root
->inode_lock
))
5034 node
= rb_next(node
);
5036 spin_unlock(&root
->inode_lock
);
5039 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
5041 struct btrfs_iget_args
*args
= p
;
5042 inode
->i_ino
= args
->location
->objectid
;
5043 memcpy(&BTRFS_I(inode
)->location
, args
->location
,
5044 sizeof(*args
->location
));
5045 BTRFS_I(inode
)->root
= args
->root
;
5049 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
5051 struct btrfs_iget_args
*args
= opaque
;
5052 return args
->location
->objectid
== BTRFS_I(inode
)->location
.objectid
&&
5053 args
->root
== BTRFS_I(inode
)->root
;
5056 static struct inode
*btrfs_iget_locked(struct super_block
*s
,
5057 struct btrfs_key
*location
,
5058 struct btrfs_root
*root
)
5060 struct inode
*inode
;
5061 struct btrfs_iget_args args
;
5062 unsigned long hashval
= btrfs_inode_hash(location
->objectid
, root
);
5064 args
.location
= location
;
5067 inode
= iget5_locked(s
, hashval
, btrfs_find_actor
,
5068 btrfs_init_locked_inode
,
5073 /* Get an inode object given its location and corresponding root.
5074 * Returns in *is_new if the inode was read from disk
5076 struct inode
*btrfs_iget(struct super_block
*s
, struct btrfs_key
*location
,
5077 struct btrfs_root
*root
, int *new)
5079 struct inode
*inode
;
5081 inode
= btrfs_iget_locked(s
, location
, root
);
5083 return ERR_PTR(-ENOMEM
);
5085 if (inode
->i_state
& I_NEW
) {
5086 btrfs_read_locked_inode(inode
);
5087 if (!is_bad_inode(inode
)) {
5088 inode_tree_add(inode
);
5089 unlock_new_inode(inode
);
5093 unlock_new_inode(inode
);
5095 inode
= ERR_PTR(-ESTALE
);
5102 static struct inode
*new_simple_dir(struct super_block
*s
,
5103 struct btrfs_key
*key
,
5104 struct btrfs_root
*root
)
5106 struct inode
*inode
= new_inode(s
);
5109 return ERR_PTR(-ENOMEM
);
5111 BTRFS_I(inode
)->root
= root
;
5112 memcpy(&BTRFS_I(inode
)->location
, key
, sizeof(*key
));
5113 set_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
);
5115 inode
->i_ino
= BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
;
5116 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
5117 inode
->i_fop
= &simple_dir_operations
;
5118 inode
->i_mode
= S_IFDIR
| S_IRUGO
| S_IWUSR
| S_IXUGO
;
5119 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
5124 struct inode
*btrfs_lookup_dentry(struct inode
*dir
, struct dentry
*dentry
)
5126 struct inode
*inode
;
5127 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5128 struct btrfs_root
*sub_root
= root
;
5129 struct btrfs_key location
;
5133 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
5134 return ERR_PTR(-ENAMETOOLONG
);
5136 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
5138 return ERR_PTR(ret
);
5140 if (location
.objectid
== 0)
5141 return ERR_PTR(-ENOENT
);
5143 if (location
.type
== BTRFS_INODE_ITEM_KEY
) {
5144 inode
= btrfs_iget(dir
->i_sb
, &location
, root
, NULL
);
5148 BUG_ON(location
.type
!= BTRFS_ROOT_ITEM_KEY
);
5150 index
= srcu_read_lock(&root
->fs_info
->subvol_srcu
);
5151 ret
= fixup_tree_root_location(root
, dir
, dentry
,
5152 &location
, &sub_root
);
5155 inode
= ERR_PTR(ret
);
5157 inode
= new_simple_dir(dir
->i_sb
, &location
, sub_root
);
5159 inode
= btrfs_iget(dir
->i_sb
, &location
, sub_root
, NULL
);
5161 srcu_read_unlock(&root
->fs_info
->subvol_srcu
, index
);
5163 if (!IS_ERR(inode
) && root
!= sub_root
) {
5164 down_read(&root
->fs_info
->cleanup_work_sem
);
5165 if (!(inode
->i_sb
->s_flags
& MS_RDONLY
))
5166 ret
= btrfs_orphan_cleanup(sub_root
);
5167 up_read(&root
->fs_info
->cleanup_work_sem
);
5170 inode
= ERR_PTR(ret
);
5177 static int btrfs_dentry_delete(const struct dentry
*dentry
)
5179 struct btrfs_root
*root
;
5180 struct inode
*inode
= dentry
->d_inode
;
5182 if (!inode
&& !IS_ROOT(dentry
))
5183 inode
= dentry
->d_parent
->d_inode
;
5186 root
= BTRFS_I(inode
)->root
;
5187 if (btrfs_root_refs(&root
->root_item
) == 0)
5190 if (btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
5196 static void btrfs_dentry_release(struct dentry
*dentry
)
5198 kfree(dentry
->d_fsdata
);
5201 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
5204 struct inode
*inode
;
5206 inode
= btrfs_lookup_dentry(dir
, dentry
);
5207 if (IS_ERR(inode
)) {
5208 if (PTR_ERR(inode
) == -ENOENT
)
5211 return ERR_CAST(inode
);
5214 return d_materialise_unique(dentry
, inode
);
5217 unsigned char btrfs_filetype_table
[] = {
5218 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
5221 static int btrfs_real_readdir(struct file
*file
, struct dir_context
*ctx
)
5223 struct inode
*inode
= file_inode(file
);
5224 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5225 struct btrfs_item
*item
;
5226 struct btrfs_dir_item
*di
;
5227 struct btrfs_key key
;
5228 struct btrfs_key found_key
;
5229 struct btrfs_path
*path
;
5230 struct list_head ins_list
;
5231 struct list_head del_list
;
5233 struct extent_buffer
*leaf
;
5235 unsigned char d_type
;
5240 int key_type
= BTRFS_DIR_INDEX_KEY
;
5244 int is_curr
= 0; /* ctx->pos points to the current index? */
5246 /* FIXME, use a real flag for deciding about the key type */
5247 if (root
->fs_info
->tree_root
== root
)
5248 key_type
= BTRFS_DIR_ITEM_KEY
;
5250 if (!dir_emit_dots(file
, ctx
))
5253 path
= btrfs_alloc_path();
5259 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5260 INIT_LIST_HEAD(&ins_list
);
5261 INIT_LIST_HEAD(&del_list
);
5262 btrfs_get_delayed_items(inode
, &ins_list
, &del_list
);
5265 btrfs_set_key_type(&key
, key_type
);
5266 key
.offset
= ctx
->pos
;
5267 key
.objectid
= btrfs_ino(inode
);
5269 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5274 leaf
= path
->nodes
[0];
5275 slot
= path
->slots
[0];
5276 if (slot
>= btrfs_header_nritems(leaf
)) {
5277 ret
= btrfs_next_leaf(root
, path
);
5285 item
= btrfs_item_nr(slot
);
5286 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
5288 if (found_key
.objectid
!= key
.objectid
)
5290 if (btrfs_key_type(&found_key
) != key_type
)
5292 if (found_key
.offset
< ctx
->pos
)
5294 if (key_type
== BTRFS_DIR_INDEX_KEY
&&
5295 btrfs_should_delete_dir_index(&del_list
,
5299 ctx
->pos
= found_key
.offset
;
5302 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
5304 di_total
= btrfs_item_size(leaf
, item
);
5306 while (di_cur
< di_total
) {
5307 struct btrfs_key location
;
5309 if (verify_dir_item(root
, leaf
, di
))
5312 name_len
= btrfs_dir_name_len(leaf
, di
);
5313 if (name_len
<= sizeof(tmp_name
)) {
5314 name_ptr
= tmp_name
;
5316 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
5322 read_extent_buffer(leaf
, name_ptr
,
5323 (unsigned long)(di
+ 1), name_len
);
5325 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
5326 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
5329 /* is this a reference to our own snapshot? If so
5332 * In contrast to old kernels, we insert the snapshot's
5333 * dir item and dir index after it has been created, so
5334 * we won't find a reference to our own snapshot. We
5335 * still keep the following code for backward
5338 if (location
.type
== BTRFS_ROOT_ITEM_KEY
&&
5339 location
.objectid
== root
->root_key
.objectid
) {
5343 over
= !dir_emit(ctx
, name_ptr
, name_len
,
5344 location
.objectid
, d_type
);
5347 if (name_ptr
!= tmp_name
)
5352 di_len
= btrfs_dir_name_len(leaf
, di
) +
5353 btrfs_dir_data_len(leaf
, di
) + sizeof(*di
);
5355 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
5361 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5364 ret
= btrfs_readdir_delayed_dir_index(ctx
, &ins_list
);
5369 /* Reached end of directory/root. Bump pos past the last item. */
5373 * Stop new entries from being returned after we return the last
5376 * New directory entries are assigned a strictly increasing
5377 * offset. This means that new entries created during readdir
5378 * are *guaranteed* to be seen in the future by that readdir.
5379 * This has broken buggy programs which operate on names as
5380 * they're returned by readdir. Until we re-use freed offsets
5381 * we have this hack to stop new entries from being returned
5382 * under the assumption that they'll never reach this huge
5385 * This is being careful not to overflow 32bit loff_t unless the
5386 * last entry requires it because doing so has broken 32bit apps
5389 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5390 if (ctx
->pos
>= INT_MAX
)
5391 ctx
->pos
= LLONG_MAX
;
5398 if (key_type
== BTRFS_DIR_INDEX_KEY
)
5399 btrfs_put_delayed_items(&ins_list
, &del_list
);
5400 btrfs_free_path(path
);
5404 int btrfs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
5406 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5407 struct btrfs_trans_handle
*trans
;
5409 bool nolock
= false;
5411 if (test_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
))
5414 if (btrfs_fs_closing(root
->fs_info
) && btrfs_is_free_space_inode(inode
))
5417 if (wbc
->sync_mode
== WB_SYNC_ALL
) {
5419 trans
= btrfs_join_transaction_nolock(root
);
5421 trans
= btrfs_join_transaction(root
);
5423 return PTR_ERR(trans
);
5424 ret
= btrfs_commit_transaction(trans
, root
);
5430 * This is somewhat expensive, updating the tree every time the
5431 * inode changes. But, it is most likely to find the inode in cache.
5432 * FIXME, needs more benchmarking...there are no reasons other than performance
5433 * to keep or drop this code.
5435 static int btrfs_dirty_inode(struct inode
*inode
)
5437 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5438 struct btrfs_trans_handle
*trans
;
5441 if (test_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
))
5444 trans
= btrfs_join_transaction(root
);
5446 return PTR_ERR(trans
);
5448 ret
= btrfs_update_inode(trans
, root
, inode
);
5449 if (ret
&& ret
== -ENOSPC
) {
5450 /* whoops, lets try again with the full transaction */
5451 btrfs_end_transaction(trans
, root
);
5452 trans
= btrfs_start_transaction(root
, 1);
5454 return PTR_ERR(trans
);
5456 ret
= btrfs_update_inode(trans
, root
, inode
);
5458 btrfs_end_transaction(trans
, root
);
5459 if (BTRFS_I(inode
)->delayed_node
)
5460 btrfs_balance_delayed_items(root
);
5466 * This is a copy of file_update_time. We need this so we can return error on
5467 * ENOSPC for updating the inode in the case of file write and mmap writes.
5469 static int btrfs_update_time(struct inode
*inode
, struct timespec
*now
,
5472 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5474 if (btrfs_root_readonly(root
))
5477 if (flags
& S_VERSION
)
5478 inode_inc_iversion(inode
);
5479 if (flags
& S_CTIME
)
5480 inode
->i_ctime
= *now
;
5481 if (flags
& S_MTIME
)
5482 inode
->i_mtime
= *now
;
5483 if (flags
& S_ATIME
)
5484 inode
->i_atime
= *now
;
5485 return btrfs_dirty_inode(inode
);
5489 * find the highest existing sequence number in a directory
5490 * and then set the in-memory index_cnt variable to reflect
5491 * free sequence numbers
5493 static int btrfs_set_inode_index_count(struct inode
*inode
)
5495 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5496 struct btrfs_key key
, found_key
;
5497 struct btrfs_path
*path
;
5498 struct extent_buffer
*leaf
;
5501 key
.objectid
= btrfs_ino(inode
);
5502 btrfs_set_key_type(&key
, BTRFS_DIR_INDEX_KEY
);
5503 key
.offset
= (u64
)-1;
5505 path
= btrfs_alloc_path();
5509 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5512 /* FIXME: we should be able to handle this */
5518 * MAGIC NUMBER EXPLANATION:
5519 * since we search a directory based on f_pos we have to start at 2
5520 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
5521 * else has to start at 2
5523 if (path
->slots
[0] == 0) {
5524 BTRFS_I(inode
)->index_cnt
= 2;
5530 leaf
= path
->nodes
[0];
5531 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
5533 if (found_key
.objectid
!= btrfs_ino(inode
) ||
5534 btrfs_key_type(&found_key
) != BTRFS_DIR_INDEX_KEY
) {
5535 BTRFS_I(inode
)->index_cnt
= 2;
5539 BTRFS_I(inode
)->index_cnt
= found_key
.offset
+ 1;
5541 btrfs_free_path(path
);
5546 * helper to find a free sequence number in a given directory. This current
5547 * code is very simple, later versions will do smarter things in the btree
5549 int btrfs_set_inode_index(struct inode
*dir
, u64
*index
)
5553 if (BTRFS_I(dir
)->index_cnt
== (u64
)-1) {
5554 ret
= btrfs_inode_delayed_dir_index_count(dir
);
5556 ret
= btrfs_set_inode_index_count(dir
);
5562 *index
= BTRFS_I(dir
)->index_cnt
;
5563 BTRFS_I(dir
)->index_cnt
++;
5568 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
5569 struct btrfs_root
*root
,
5571 const char *name
, int name_len
,
5572 u64 ref_objectid
, u64 objectid
,
5573 umode_t mode
, u64
*index
)
5575 struct inode
*inode
;
5576 struct btrfs_inode_item
*inode_item
;
5577 struct btrfs_key
*location
;
5578 struct btrfs_path
*path
;
5579 struct btrfs_inode_ref
*ref
;
5580 struct btrfs_key key
[2];
5582 int nitems
= name
? 2 : 1;
5586 path
= btrfs_alloc_path();
5588 return ERR_PTR(-ENOMEM
);
5590 inode
= new_inode(root
->fs_info
->sb
);
5592 btrfs_free_path(path
);
5593 return ERR_PTR(-ENOMEM
);
5597 * we have to initialize this early, so we can reclaim the inode
5598 * number if we fail afterwards in this function.
5600 inode
->i_ino
= objectid
;
5603 trace_btrfs_inode_request(dir
);
5605 ret
= btrfs_set_inode_index(dir
, index
);
5607 btrfs_free_path(path
);
5609 return ERR_PTR(ret
);
5615 * index_cnt is ignored for everything but a dir,
5616 * btrfs_get_inode_index_count has an explanation for the magic
5619 BTRFS_I(inode
)->index_cnt
= 2;
5620 BTRFS_I(inode
)->dir_index
= *index
;
5621 BTRFS_I(inode
)->root
= root
;
5622 BTRFS_I(inode
)->generation
= trans
->transid
;
5623 inode
->i_generation
= BTRFS_I(inode
)->generation
;
5626 * We could have gotten an inode number from somebody who was fsynced
5627 * and then removed in this same transaction, so let's just set full
5628 * sync since it will be a full sync anyway and this will blow away the
5629 * old info in the log.
5631 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
5633 key
[0].objectid
= objectid
;
5634 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
5637 sizes
[0] = sizeof(struct btrfs_inode_item
);
5641 * Start new inodes with an inode_ref. This is slightly more
5642 * efficient for small numbers of hard links since they will
5643 * be packed into one item. Extended refs will kick in if we
5644 * add more hard links than can fit in the ref item.
5646 key
[1].objectid
= objectid
;
5647 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
5648 key
[1].offset
= ref_objectid
;
5650 sizes
[1] = name_len
+ sizeof(*ref
);
5653 path
->leave_spinning
= 1;
5654 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, nitems
);
5658 inode_init_owner(inode
, dir
, mode
);
5659 inode_set_bytes(inode
, 0);
5660 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
5661 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
5662 struct btrfs_inode_item
);
5663 memset_extent_buffer(path
->nodes
[0], 0, (unsigned long)inode_item
,
5664 sizeof(*inode_item
));
5665 fill_inode_item(trans
, path
->nodes
[0], inode_item
, inode
);
5668 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
5669 struct btrfs_inode_ref
);
5670 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
5671 btrfs_set_inode_ref_index(path
->nodes
[0], ref
, *index
);
5672 ptr
= (unsigned long)(ref
+ 1);
5673 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
5676 btrfs_mark_buffer_dirty(path
->nodes
[0]);
5677 btrfs_free_path(path
);
5679 location
= &BTRFS_I(inode
)->location
;
5680 location
->objectid
= objectid
;
5681 location
->offset
= 0;
5682 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
5684 btrfs_inherit_iflags(inode
, dir
);
5686 if (S_ISREG(mode
)) {
5687 if (btrfs_test_opt(root
, NODATASUM
))
5688 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
5689 if (btrfs_test_opt(root
, NODATACOW
))
5690 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
|
5691 BTRFS_INODE_NODATASUM
;
5694 btrfs_insert_inode_hash(inode
);
5695 inode_tree_add(inode
);
5697 trace_btrfs_inode_new(inode
);
5698 btrfs_set_inode_last_trans(trans
, inode
);
5700 btrfs_update_root_times(trans
, root
);
5702 ret
= btrfs_inode_inherit_props(trans
, inode
, dir
);
5704 btrfs_err(root
->fs_info
,
5705 "error inheriting props for ino %llu (root %llu): %d",
5706 btrfs_ino(inode
), root
->root_key
.objectid
, ret
);
5711 BTRFS_I(dir
)->index_cnt
--;
5712 btrfs_free_path(path
);
5714 return ERR_PTR(ret
);
5717 static inline u8
btrfs_inode_type(struct inode
*inode
)
5719 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
5723 * utility function to add 'inode' into 'parent_inode' with
5724 * a give name and a given sequence number.
5725 * if 'add_backref' is true, also insert a backref from the
5726 * inode to the parent directory.
5728 int btrfs_add_link(struct btrfs_trans_handle
*trans
,
5729 struct inode
*parent_inode
, struct inode
*inode
,
5730 const char *name
, int name_len
, int add_backref
, u64 index
)
5733 struct btrfs_key key
;
5734 struct btrfs_root
*root
= BTRFS_I(parent_inode
)->root
;
5735 u64 ino
= btrfs_ino(inode
);
5736 u64 parent_ino
= btrfs_ino(parent_inode
);
5738 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
5739 memcpy(&key
, &BTRFS_I(inode
)->root
->root_key
, sizeof(key
));
5742 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
5746 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
5747 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
5748 key
.objectid
, root
->root_key
.objectid
,
5749 parent_ino
, index
, name
, name_len
);
5750 } else if (add_backref
) {
5751 ret
= btrfs_insert_inode_ref(trans
, root
, name
, name_len
, ino
,
5755 /* Nothing to clean up yet */
5759 ret
= btrfs_insert_dir_item(trans
, root
, name
, name_len
,
5761 btrfs_inode_type(inode
), index
);
5762 if (ret
== -EEXIST
|| ret
== -EOVERFLOW
)
5765 btrfs_abort_transaction(trans
, root
, ret
);
5769 btrfs_i_size_write(parent_inode
, parent_inode
->i_size
+
5771 inode_inc_iversion(parent_inode
);
5772 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
5773 ret
= btrfs_update_inode(trans
, root
, parent_inode
);
5775 btrfs_abort_transaction(trans
, root
, ret
);
5779 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
5782 err
= btrfs_del_root_ref(trans
, root
->fs_info
->tree_root
,
5783 key
.objectid
, root
->root_key
.objectid
,
5784 parent_ino
, &local_index
, name
, name_len
);
5786 } else if (add_backref
) {
5790 err
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
5791 ino
, parent_ino
, &local_index
);
5796 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
5797 struct inode
*dir
, struct dentry
*dentry
,
5798 struct inode
*inode
, int backref
, u64 index
)
5800 int err
= btrfs_add_link(trans
, dir
, inode
,
5801 dentry
->d_name
.name
, dentry
->d_name
.len
,
5808 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
5809 umode_t mode
, dev_t rdev
)
5811 struct btrfs_trans_handle
*trans
;
5812 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5813 struct inode
*inode
= NULL
;
5819 if (!new_valid_dev(rdev
))
5823 * 2 for inode item and ref
5825 * 1 for xattr if selinux is on
5827 trans
= btrfs_start_transaction(root
, 5);
5829 return PTR_ERR(trans
);
5831 err
= btrfs_find_free_ino(root
, &objectid
);
5835 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
5836 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
5838 if (IS_ERR(inode
)) {
5839 err
= PTR_ERR(inode
);
5843 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
5850 * If the active LSM wants to access the inode during
5851 * d_instantiate it needs these. Smack checks to see
5852 * if the filesystem supports xattrs by looking at the
5856 inode
->i_op
= &btrfs_special_inode_operations
;
5857 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
5861 init_special_inode(inode
, inode
->i_mode
, rdev
);
5862 btrfs_update_inode(trans
, root
, inode
);
5863 d_instantiate(dentry
, inode
);
5866 btrfs_end_transaction(trans
, root
);
5867 btrfs_balance_delayed_items(root
);
5868 btrfs_btree_balance_dirty(root
);
5870 inode_dec_link_count(inode
);
5876 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
5877 umode_t mode
, bool excl
)
5879 struct btrfs_trans_handle
*trans
;
5880 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5881 struct inode
*inode
= NULL
;
5882 int drop_inode_on_err
= 0;
5888 * 2 for inode item and ref
5890 * 1 for xattr if selinux is on
5892 trans
= btrfs_start_transaction(root
, 5);
5894 return PTR_ERR(trans
);
5896 err
= btrfs_find_free_ino(root
, &objectid
);
5900 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
5901 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
5903 if (IS_ERR(inode
)) {
5904 err
= PTR_ERR(inode
);
5907 drop_inode_on_err
= 1;
5909 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
5913 err
= btrfs_update_inode(trans
, root
, inode
);
5918 * If the active LSM wants to access the inode during
5919 * d_instantiate it needs these. Smack checks to see
5920 * if the filesystem supports xattrs by looking at the
5923 inode
->i_fop
= &btrfs_file_operations
;
5924 inode
->i_op
= &btrfs_file_inode_operations
;
5926 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
5930 inode
->i_mapping
->a_ops
= &btrfs_aops
;
5931 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
5932 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
5933 d_instantiate(dentry
, inode
);
5936 btrfs_end_transaction(trans
, root
);
5937 if (err
&& drop_inode_on_err
) {
5938 inode_dec_link_count(inode
);
5941 btrfs_balance_delayed_items(root
);
5942 btrfs_btree_balance_dirty(root
);
5946 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
5947 struct dentry
*dentry
)
5949 struct btrfs_trans_handle
*trans
;
5950 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5951 struct inode
*inode
= old_dentry
->d_inode
;
5956 /* do not allow sys_link's with other subvols of the same device */
5957 if (root
->objectid
!= BTRFS_I(inode
)->root
->objectid
)
5960 if (inode
->i_nlink
>= BTRFS_LINK_MAX
)
5963 err
= btrfs_set_inode_index(dir
, &index
);
5968 * 2 items for inode and inode ref
5969 * 2 items for dir items
5970 * 1 item for parent inode
5972 trans
= btrfs_start_transaction(root
, 5);
5973 if (IS_ERR(trans
)) {
5974 err
= PTR_ERR(trans
);
5978 /* There are several dir indexes for this inode, clear the cache. */
5979 BTRFS_I(inode
)->dir_index
= 0ULL;
5981 inode_inc_iversion(inode
);
5982 inode
->i_ctime
= CURRENT_TIME
;
5984 set_bit(BTRFS_INODE_COPY_EVERYTHING
, &BTRFS_I(inode
)->runtime_flags
);
5986 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 1, index
);
5991 struct dentry
*parent
= dentry
->d_parent
;
5992 err
= btrfs_update_inode(trans
, root
, inode
);
5995 if (inode
->i_nlink
== 1) {
5997 * If new hard link count is 1, it's a file created
5998 * with open(2) O_TMPFILE flag.
6000 err
= btrfs_orphan_del(trans
, inode
);
6004 d_instantiate(dentry
, inode
);
6005 btrfs_log_new_name(trans
, inode
, NULL
, parent
);
6008 btrfs_end_transaction(trans
, root
);
6009 btrfs_balance_delayed_items(root
);
6012 inode_dec_link_count(inode
);
6015 btrfs_btree_balance_dirty(root
);
6019 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
6021 struct inode
*inode
= NULL
;
6022 struct btrfs_trans_handle
*trans
;
6023 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6025 int drop_on_err
= 0;
6030 * 2 items for inode and ref
6031 * 2 items for dir items
6032 * 1 for xattr if selinux is on
6034 trans
= btrfs_start_transaction(root
, 5);
6036 return PTR_ERR(trans
);
6038 err
= btrfs_find_free_ino(root
, &objectid
);
6042 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6043 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
6044 S_IFDIR
| mode
, &index
);
6045 if (IS_ERR(inode
)) {
6046 err
= PTR_ERR(inode
);
6052 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6056 inode
->i_op
= &btrfs_dir_inode_operations
;
6057 inode
->i_fop
= &btrfs_dir_file_operations
;
6059 btrfs_i_size_write(inode
, 0);
6060 err
= btrfs_update_inode(trans
, root
, inode
);
6064 err
= btrfs_add_link(trans
, dir
, inode
, dentry
->d_name
.name
,
6065 dentry
->d_name
.len
, 0, index
);
6069 d_instantiate(dentry
, inode
);
6073 btrfs_end_transaction(trans
, root
);
6076 btrfs_balance_delayed_items(root
);
6077 btrfs_btree_balance_dirty(root
);
6081 /* helper for btfs_get_extent. Given an existing extent in the tree,
6082 * and an extent that you want to insert, deal with overlap and insert
6083 * the new extent into the tree.
6085 static int merge_extent_mapping(struct extent_map_tree
*em_tree
,
6086 struct extent_map
*existing
,
6087 struct extent_map
*em
,
6088 u64 map_start
, u64 map_len
)
6092 BUG_ON(map_start
< em
->start
|| map_start
>= extent_map_end(em
));
6093 start_diff
= map_start
- em
->start
;
6094 em
->start
= map_start
;
6096 if (em
->block_start
< EXTENT_MAP_LAST_BYTE
&&
6097 !test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
)) {
6098 em
->block_start
+= start_diff
;
6099 em
->block_len
-= start_diff
;
6101 return add_extent_mapping(em_tree
, em
, 0);
6104 static noinline
int uncompress_inline(struct btrfs_path
*path
,
6105 struct inode
*inode
, struct page
*page
,
6106 size_t pg_offset
, u64 extent_offset
,
6107 struct btrfs_file_extent_item
*item
)
6110 struct extent_buffer
*leaf
= path
->nodes
[0];
6113 unsigned long inline_size
;
6117 WARN_ON(pg_offset
!= 0);
6118 compress_type
= btrfs_file_extent_compression(leaf
, item
);
6119 max_size
= btrfs_file_extent_ram_bytes(leaf
, item
);
6120 inline_size
= btrfs_file_extent_inline_item_len(leaf
,
6121 btrfs_item_nr(path
->slots
[0]));
6122 tmp
= kmalloc(inline_size
, GFP_NOFS
);
6125 ptr
= btrfs_file_extent_inline_start(item
);
6127 read_extent_buffer(leaf
, tmp
, ptr
, inline_size
);
6129 max_size
= min_t(unsigned long, PAGE_CACHE_SIZE
, max_size
);
6130 ret
= btrfs_decompress(compress_type
, tmp
, page
,
6131 extent_offset
, inline_size
, max_size
);
6137 * a bit scary, this does extent mapping from logical file offset to the disk.
6138 * the ugly parts come from merging extents from the disk with the in-ram
6139 * representation. This gets more complex because of the data=ordered code,
6140 * where the in-ram extents might be locked pending data=ordered completion.
6142 * This also copies inline extents directly into the page.
6145 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
6146 size_t pg_offset
, u64 start
, u64 len
,
6151 u64 extent_start
= 0;
6153 u64 objectid
= btrfs_ino(inode
);
6155 struct btrfs_path
*path
= NULL
;
6156 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6157 struct btrfs_file_extent_item
*item
;
6158 struct extent_buffer
*leaf
;
6159 struct btrfs_key found_key
;
6160 struct extent_map
*em
= NULL
;
6161 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
6162 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
6163 struct btrfs_trans_handle
*trans
= NULL
;
6164 const bool new_inline
= !page
|| create
;
6167 read_lock(&em_tree
->lock
);
6168 em
= lookup_extent_mapping(em_tree
, start
, len
);
6170 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6171 read_unlock(&em_tree
->lock
);
6174 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
6175 free_extent_map(em
);
6176 else if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
6177 free_extent_map(em
);
6181 em
= alloc_extent_map();
6186 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6187 em
->start
= EXTENT_MAP_HOLE
;
6188 em
->orig_start
= EXTENT_MAP_HOLE
;
6190 em
->block_len
= (u64
)-1;
6193 path
= btrfs_alloc_path();
6199 * Chances are we'll be called again, so go ahead and do
6205 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
6206 objectid
, start
, trans
!= NULL
);
6213 if (path
->slots
[0] == 0)
6218 leaf
= path
->nodes
[0];
6219 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
6220 struct btrfs_file_extent_item
);
6221 /* are we inside the extent that was found? */
6222 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6223 found_type
= btrfs_key_type(&found_key
);
6224 if (found_key
.objectid
!= objectid
||
6225 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
6227 * If we backup past the first extent we want to move forward
6228 * and see if there is an extent in front of us, otherwise we'll
6229 * say there is a hole for our whole search range which can
6236 found_type
= btrfs_file_extent_type(leaf
, item
);
6237 extent_start
= found_key
.offset
;
6238 if (found_type
== BTRFS_FILE_EXTENT_REG
||
6239 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6240 extent_end
= extent_start
+
6241 btrfs_file_extent_num_bytes(leaf
, item
);
6242 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
6244 size
= btrfs_file_extent_inline_len(leaf
, path
->slots
[0], item
);
6245 extent_end
= ALIGN(extent_start
+ size
, root
->sectorsize
);
6248 if (start
>= extent_end
) {
6250 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
6251 ret
= btrfs_next_leaf(root
, path
);
6258 leaf
= path
->nodes
[0];
6260 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6261 if (found_key
.objectid
!= objectid
||
6262 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
6264 if (start
+ len
<= found_key
.offset
)
6267 em
->orig_start
= start
;
6268 em
->len
= found_key
.offset
- start
;
6272 btrfs_extent_item_to_extent_map(inode
, path
, item
, new_inline
, em
);
6274 if (found_type
== BTRFS_FILE_EXTENT_REG
||
6275 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6277 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
6281 size_t extent_offset
;
6287 size
= btrfs_file_extent_inline_len(leaf
, path
->slots
[0], item
);
6288 extent_offset
= page_offset(page
) + pg_offset
- extent_start
;
6289 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
6290 size
- extent_offset
);
6291 em
->start
= extent_start
+ extent_offset
;
6292 em
->len
= ALIGN(copy_size
, root
->sectorsize
);
6293 em
->orig_block_len
= em
->len
;
6294 em
->orig_start
= em
->start
;
6295 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
6296 if (create
== 0 && !PageUptodate(page
)) {
6297 if (btrfs_file_extent_compression(leaf
, item
) !=
6298 BTRFS_COMPRESS_NONE
) {
6299 ret
= uncompress_inline(path
, inode
, page
,
6301 extent_offset
, item
);
6308 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
6310 if (pg_offset
+ copy_size
< PAGE_CACHE_SIZE
) {
6311 memset(map
+ pg_offset
+ copy_size
, 0,
6312 PAGE_CACHE_SIZE
- pg_offset
-
6317 flush_dcache_page(page
);
6318 } else if (create
&& PageUptodate(page
)) {
6322 free_extent_map(em
);
6325 btrfs_release_path(path
);
6326 trans
= btrfs_join_transaction(root
);
6329 return ERR_CAST(trans
);
6333 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
6336 btrfs_mark_buffer_dirty(leaf
);
6338 set_extent_uptodate(io_tree
, em
->start
,
6339 extent_map_end(em
) - 1, NULL
, GFP_NOFS
);
6344 em
->orig_start
= start
;
6347 em
->block_start
= EXTENT_MAP_HOLE
;
6348 set_bit(EXTENT_FLAG_VACANCY
, &em
->flags
);
6350 btrfs_release_path(path
);
6351 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
6352 btrfs_err(root
->fs_info
, "bad extent! em: [%llu %llu] passed [%llu %llu]",
6353 em
->start
, em
->len
, start
, len
);
6359 write_lock(&em_tree
->lock
);
6360 ret
= add_extent_mapping(em_tree
, em
, 0);
6361 /* it is possible that someone inserted the extent into the tree
6362 * while we had the lock dropped. It is also possible that
6363 * an overlapping map exists in the tree
6365 if (ret
== -EEXIST
) {
6366 struct extent_map
*existing
;
6370 existing
= lookup_extent_mapping(em_tree
, start
, len
);
6371 if (existing
&& (existing
->start
> start
||
6372 existing
->start
+ existing
->len
<= start
)) {
6373 free_extent_map(existing
);
6377 existing
= lookup_extent_mapping(em_tree
, em
->start
,
6380 err
= merge_extent_mapping(em_tree
, existing
,
6383 free_extent_map(existing
);
6385 free_extent_map(em
);
6390 free_extent_map(em
);
6394 free_extent_map(em
);
6399 write_unlock(&em_tree
->lock
);
6402 trace_btrfs_get_extent(root
, em
);
6405 btrfs_free_path(path
);
6407 ret
= btrfs_end_transaction(trans
, root
);
6412 free_extent_map(em
);
6413 return ERR_PTR(err
);
6415 BUG_ON(!em
); /* Error is always set */
6419 struct extent_map
*btrfs_get_extent_fiemap(struct inode
*inode
, struct page
*page
,
6420 size_t pg_offset
, u64 start
, u64 len
,
6423 struct extent_map
*em
;
6424 struct extent_map
*hole_em
= NULL
;
6425 u64 range_start
= start
;
6431 em
= btrfs_get_extent(inode
, page
, pg_offset
, start
, len
, create
);
6438 * - a pre-alloc extent,
6439 * there might actually be delalloc bytes behind it.
6441 if (em
->block_start
!= EXTENT_MAP_HOLE
&&
6442 !test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
6448 /* check to see if we've wrapped (len == -1 or similar) */
6457 /* ok, we didn't find anything, lets look for delalloc */
6458 found
= count_range_bits(&BTRFS_I(inode
)->io_tree
, &range_start
,
6459 end
, len
, EXTENT_DELALLOC
, 1);
6460 found_end
= range_start
+ found
;
6461 if (found_end
< range_start
)
6462 found_end
= (u64
)-1;
6465 * we didn't find anything useful, return
6466 * the original results from get_extent()
6468 if (range_start
> end
|| found_end
<= start
) {
6474 /* adjust the range_start to make sure it doesn't
6475 * go backwards from the start they passed in
6477 range_start
= max(start
, range_start
);
6478 found
= found_end
- range_start
;
6481 u64 hole_start
= start
;
6484 em
= alloc_extent_map();
6490 * when btrfs_get_extent can't find anything it
6491 * returns one huge hole
6493 * make sure what it found really fits our range, and
6494 * adjust to make sure it is based on the start from
6498 u64 calc_end
= extent_map_end(hole_em
);
6500 if (calc_end
<= start
|| (hole_em
->start
> end
)) {
6501 free_extent_map(hole_em
);
6504 hole_start
= max(hole_em
->start
, start
);
6505 hole_len
= calc_end
- hole_start
;
6509 if (hole_em
&& range_start
> hole_start
) {
6510 /* our hole starts before our delalloc, so we
6511 * have to return just the parts of the hole
6512 * that go until the delalloc starts
6514 em
->len
= min(hole_len
,
6515 range_start
- hole_start
);
6516 em
->start
= hole_start
;
6517 em
->orig_start
= hole_start
;
6519 * don't adjust block start at all,
6520 * it is fixed at EXTENT_MAP_HOLE
6522 em
->block_start
= hole_em
->block_start
;
6523 em
->block_len
= hole_len
;
6524 if (test_bit(EXTENT_FLAG_PREALLOC
, &hole_em
->flags
))
6525 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
6527 em
->start
= range_start
;
6529 em
->orig_start
= range_start
;
6530 em
->block_start
= EXTENT_MAP_DELALLOC
;
6531 em
->block_len
= found
;
6533 } else if (hole_em
) {
6538 free_extent_map(hole_em
);
6540 free_extent_map(em
);
6541 return ERR_PTR(err
);
6546 static struct extent_map
*btrfs_new_extent_direct(struct inode
*inode
,
6549 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6550 struct extent_map
*em
;
6551 struct btrfs_key ins
;
6555 alloc_hint
= get_extent_allocation_hint(inode
, start
, len
);
6556 ret
= btrfs_reserve_extent(root
, len
, root
->sectorsize
, 0,
6557 alloc_hint
, &ins
, 1, 1);
6559 return ERR_PTR(ret
);
6561 em
= create_pinned_em(inode
, start
, ins
.offset
, start
, ins
.objectid
,
6562 ins
.offset
, ins
.offset
, ins
.offset
, 0);
6564 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
6568 ret
= btrfs_add_ordered_extent_dio(inode
, start
, ins
.objectid
,
6569 ins
.offset
, ins
.offset
, 0);
6571 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
6572 free_extent_map(em
);
6573 return ERR_PTR(ret
);
6580 * returns 1 when the nocow is safe, < 1 on error, 0 if the
6581 * block must be cow'd
6583 noinline
int can_nocow_extent(struct inode
*inode
, u64 offset
, u64
*len
,
6584 u64
*orig_start
, u64
*orig_block_len
,
6587 struct btrfs_trans_handle
*trans
;
6588 struct btrfs_path
*path
;
6590 struct extent_buffer
*leaf
;
6591 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6592 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
6593 struct btrfs_file_extent_item
*fi
;
6594 struct btrfs_key key
;
6601 bool nocow
= (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
);
6603 path
= btrfs_alloc_path();
6607 ret
= btrfs_lookup_file_extent(NULL
, root
, path
, btrfs_ino(inode
),
6612 slot
= path
->slots
[0];
6615 /* can't find the item, must cow */
6622 leaf
= path
->nodes
[0];
6623 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
6624 if (key
.objectid
!= btrfs_ino(inode
) ||
6625 key
.type
!= BTRFS_EXTENT_DATA_KEY
) {
6626 /* not our file or wrong item type, must cow */
6630 if (key
.offset
> offset
) {
6631 /* Wrong offset, must cow */
6635 fi
= btrfs_item_ptr(leaf
, slot
, struct btrfs_file_extent_item
);
6636 found_type
= btrfs_file_extent_type(leaf
, fi
);
6637 if (found_type
!= BTRFS_FILE_EXTENT_REG
&&
6638 found_type
!= BTRFS_FILE_EXTENT_PREALLOC
) {
6639 /* not a regular extent, must cow */
6643 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_REG
)
6646 extent_end
= key
.offset
+ btrfs_file_extent_num_bytes(leaf
, fi
);
6647 if (extent_end
<= offset
)
6650 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
6651 if (disk_bytenr
== 0)
6654 if (btrfs_file_extent_compression(leaf
, fi
) ||
6655 btrfs_file_extent_encryption(leaf
, fi
) ||
6656 btrfs_file_extent_other_encoding(leaf
, fi
))
6659 backref_offset
= btrfs_file_extent_offset(leaf
, fi
);
6662 *orig_start
= key
.offset
- backref_offset
;
6663 *orig_block_len
= btrfs_file_extent_disk_num_bytes(leaf
, fi
);
6664 *ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
6667 if (btrfs_extent_readonly(root
, disk_bytenr
))
6670 num_bytes
= min(offset
+ *len
, extent_end
) - offset
;
6671 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6674 range_end
= round_up(offset
+ num_bytes
, root
->sectorsize
) - 1;
6675 ret
= test_range_bit(io_tree
, offset
, range_end
,
6676 EXTENT_DELALLOC
, 0, NULL
);
6683 btrfs_release_path(path
);
6686 * look for other files referencing this extent, if we
6687 * find any we must cow
6689 trans
= btrfs_join_transaction(root
);
6690 if (IS_ERR(trans
)) {
6695 ret
= btrfs_cross_ref_exist(trans
, root
, btrfs_ino(inode
),
6696 key
.offset
- backref_offset
, disk_bytenr
);
6697 btrfs_end_transaction(trans
, root
);
6704 * adjust disk_bytenr and num_bytes to cover just the bytes
6705 * in this extent we are about to write. If there
6706 * are any csums in that range we have to cow in order
6707 * to keep the csums correct
6709 disk_bytenr
+= backref_offset
;
6710 disk_bytenr
+= offset
- key
.offset
;
6711 if (csum_exist_in_range(root
, disk_bytenr
, num_bytes
))
6714 * all of the above have passed, it is safe to overwrite this extent
6720 btrfs_free_path(path
);
6724 bool btrfs_page_exists_in_range(struct inode
*inode
, loff_t start
, loff_t end
)
6726 struct radix_tree_root
*root
= &inode
->i_mapping
->page_tree
;
6728 void **pagep
= NULL
;
6729 struct page
*page
= NULL
;
6733 start_idx
= start
>> PAGE_CACHE_SHIFT
;
6736 * end is the last byte in the last page. end == start is legal
6738 end_idx
= end
>> PAGE_CACHE_SHIFT
;
6742 /* Most of the code in this while loop is lifted from
6743 * find_get_page. It's been modified to begin searching from a
6744 * page and return just the first page found in that range. If the
6745 * found idx is less than or equal to the end idx then we know that
6746 * a page exists. If no pages are found or if those pages are
6747 * outside of the range then we're fine (yay!) */
6748 while (page
== NULL
&&
6749 radix_tree_gang_lookup_slot(root
, &pagep
, NULL
, start_idx
, 1)) {
6750 page
= radix_tree_deref_slot(pagep
);
6751 if (unlikely(!page
))
6754 if (radix_tree_exception(page
)) {
6755 if (radix_tree_deref_retry(page
)) {
6760 * Otherwise, shmem/tmpfs must be storing a swap entry
6761 * here as an exceptional entry: so return it without
6762 * attempting to raise page count.
6765 break; /* TODO: Is this relevant for this use case? */
6768 if (!page_cache_get_speculative(page
)) {
6774 * Has the page moved?
6775 * This is part of the lockless pagecache protocol. See
6776 * include/linux/pagemap.h for details.
6778 if (unlikely(page
!= *pagep
)) {
6779 page_cache_release(page
);
6785 if (page
->index
<= end_idx
)
6787 page_cache_release(page
);
6794 static int lock_extent_direct(struct inode
*inode
, u64 lockstart
, u64 lockend
,
6795 struct extent_state
**cached_state
, int writing
)
6797 struct btrfs_ordered_extent
*ordered
;
6801 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
6804 * We're concerned with the entire range that we're going to be
6805 * doing DIO to, so we need to make sure theres no ordered
6806 * extents in this range.
6808 ordered
= btrfs_lookup_ordered_range(inode
, lockstart
,
6809 lockend
- lockstart
+ 1);
6812 * We need to make sure there are no buffered pages in this
6813 * range either, we could have raced between the invalidate in
6814 * generic_file_direct_write and locking the extent. The
6815 * invalidate needs to happen so that reads after a write do not
6820 !btrfs_page_exists_in_range(inode
, lockstart
, lockend
)))
6823 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
6824 cached_state
, GFP_NOFS
);
6827 btrfs_start_ordered_extent(inode
, ordered
, 1);
6828 btrfs_put_ordered_extent(ordered
);
6830 /* Screw you mmap */
6831 ret
= filemap_write_and_wait_range(inode
->i_mapping
,
6838 * If we found a page that couldn't be invalidated just
6839 * fall back to buffered.
6841 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
6842 lockstart
>> PAGE_CACHE_SHIFT
,
6843 lockend
>> PAGE_CACHE_SHIFT
);
6854 static struct extent_map
*create_pinned_em(struct inode
*inode
, u64 start
,
6855 u64 len
, u64 orig_start
,
6856 u64 block_start
, u64 block_len
,
6857 u64 orig_block_len
, u64 ram_bytes
,
6860 struct extent_map_tree
*em_tree
;
6861 struct extent_map
*em
;
6862 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6865 em_tree
= &BTRFS_I(inode
)->extent_tree
;
6866 em
= alloc_extent_map();
6868 return ERR_PTR(-ENOMEM
);
6871 em
->orig_start
= orig_start
;
6872 em
->mod_start
= start
;
6875 em
->block_len
= block_len
;
6876 em
->block_start
= block_start
;
6877 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6878 em
->orig_block_len
= orig_block_len
;
6879 em
->ram_bytes
= ram_bytes
;
6880 em
->generation
= -1;
6881 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
6882 if (type
== BTRFS_ORDERED_PREALLOC
)
6883 set_bit(EXTENT_FLAG_FILLING
, &em
->flags
);
6886 btrfs_drop_extent_cache(inode
, em
->start
,
6887 em
->start
+ em
->len
- 1, 0);
6888 write_lock(&em_tree
->lock
);
6889 ret
= add_extent_mapping(em_tree
, em
, 1);
6890 write_unlock(&em_tree
->lock
);
6891 } while (ret
== -EEXIST
);
6894 free_extent_map(em
);
6895 return ERR_PTR(ret
);
6902 static int btrfs_get_blocks_direct(struct inode
*inode
, sector_t iblock
,
6903 struct buffer_head
*bh_result
, int create
)
6905 struct extent_map
*em
;
6906 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6907 struct extent_state
*cached_state
= NULL
;
6908 u64 start
= iblock
<< inode
->i_blkbits
;
6909 u64 lockstart
, lockend
;
6910 u64 len
= bh_result
->b_size
;
6911 int unlock_bits
= EXTENT_LOCKED
;
6915 unlock_bits
|= EXTENT_DELALLOC
| EXTENT_DIRTY
;
6917 len
= min_t(u64
, len
, root
->sectorsize
);
6920 lockend
= start
+ len
- 1;
6923 * If this errors out it's because we couldn't invalidate pagecache for
6924 * this range and we need to fallback to buffered.
6926 if (lock_extent_direct(inode
, lockstart
, lockend
, &cached_state
, create
))
6929 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
6936 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
6937 * io. INLINE is special, and we could probably kludge it in here, but
6938 * it's still buffered so for safety lets just fall back to the generic
6941 * For COMPRESSED we _have_ to read the entire extent in so we can
6942 * decompress it, so there will be buffering required no matter what we
6943 * do, so go ahead and fallback to buffered.
6945 * We return -ENOTBLK because thats what makes DIO go ahead and go back
6946 * to buffered IO. Don't blame me, this is the price we pay for using
6949 if (test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
) ||
6950 em
->block_start
== EXTENT_MAP_INLINE
) {
6951 free_extent_map(em
);
6956 /* Just a good old fashioned hole, return */
6957 if (!create
&& (em
->block_start
== EXTENT_MAP_HOLE
||
6958 test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))) {
6959 free_extent_map(em
);
6964 * We don't allocate a new extent in the following cases
6966 * 1) The inode is marked as NODATACOW. In this case we'll just use the
6968 * 2) The extent is marked as PREALLOC. We're good to go here and can
6969 * just use the extent.
6973 len
= min(len
, em
->len
- (start
- em
->start
));
6974 lockstart
= start
+ len
;
6978 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
) ||
6979 ((BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
) &&
6980 em
->block_start
!= EXTENT_MAP_HOLE
)) {
6983 u64 block_start
, orig_start
, orig_block_len
, ram_bytes
;
6985 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
6986 type
= BTRFS_ORDERED_PREALLOC
;
6988 type
= BTRFS_ORDERED_NOCOW
;
6989 len
= min(len
, em
->len
- (start
- em
->start
));
6990 block_start
= em
->block_start
+ (start
- em
->start
);
6992 if (can_nocow_extent(inode
, start
, &len
, &orig_start
,
6993 &orig_block_len
, &ram_bytes
) == 1) {
6994 if (type
== BTRFS_ORDERED_PREALLOC
) {
6995 free_extent_map(em
);
6996 em
= create_pinned_em(inode
, start
, len
,
7005 ret
= btrfs_add_ordered_extent_dio(inode
, start
,
7006 block_start
, len
, len
, type
);
7008 free_extent_map(em
);
7016 * this will cow the extent, reset the len in case we changed
7019 len
= bh_result
->b_size
;
7020 free_extent_map(em
);
7021 em
= btrfs_new_extent_direct(inode
, start
, len
);
7026 len
= min(len
, em
->len
- (start
- em
->start
));
7028 bh_result
->b_blocknr
= (em
->block_start
+ (start
- em
->start
)) >>
7030 bh_result
->b_size
= len
;
7031 bh_result
->b_bdev
= em
->bdev
;
7032 set_buffer_mapped(bh_result
);
7034 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
7035 set_buffer_new(bh_result
);
7038 * Need to update the i_size under the extent lock so buffered
7039 * readers will get the updated i_size when we unlock.
7041 if (start
+ len
> i_size_read(inode
))
7042 i_size_write(inode
, start
+ len
);
7044 spin_lock(&BTRFS_I(inode
)->lock
);
7045 BTRFS_I(inode
)->outstanding_extents
++;
7046 spin_unlock(&BTRFS_I(inode
)->lock
);
7048 ret
= set_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
,
7049 lockstart
+ len
- 1, EXTENT_DELALLOC
, NULL
,
7050 &cached_state
, GFP_NOFS
);
7055 * In the case of write we need to clear and unlock the entire range,
7056 * in the case of read we need to unlock only the end area that we
7057 * aren't using if there is any left over space.
7059 if (lockstart
< lockend
) {
7060 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
,
7061 lockend
, unlock_bits
, 1, 0,
7062 &cached_state
, GFP_NOFS
);
7064 free_extent_state(cached_state
);
7067 free_extent_map(em
);
7072 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7073 unlock_bits
, 1, 0, &cached_state
, GFP_NOFS
);
7077 static void btrfs_endio_direct_read(struct bio
*bio
, int err
)
7079 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7080 struct bio_vec
*bvec
;
7081 struct inode
*inode
= dip
->inode
;
7082 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7083 struct bio
*dio_bio
;
7084 u32
*csums
= (u32
*)dip
->csum
;
7088 start
= dip
->logical_offset
;
7089 bio_for_each_segment_all(bvec
, bio
, i
) {
7090 if (!(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)) {
7091 struct page
*page
= bvec
->bv_page
;
7094 unsigned long flags
;
7096 local_irq_save(flags
);
7097 kaddr
= kmap_atomic(page
);
7098 csum
= btrfs_csum_data(kaddr
+ bvec
->bv_offset
,
7099 csum
, bvec
->bv_len
);
7100 btrfs_csum_final(csum
, (char *)&csum
);
7101 kunmap_atomic(kaddr
);
7102 local_irq_restore(flags
);
7104 flush_dcache_page(bvec
->bv_page
);
7105 if (csum
!= csums
[i
]) {
7106 btrfs_err(root
->fs_info
, "csum failed ino %llu off %llu csum %u expected csum %u",
7107 btrfs_ino(inode
), start
, csum
,
7113 start
+= bvec
->bv_len
;
7116 unlock_extent(&BTRFS_I(inode
)->io_tree
, dip
->logical_offset
,
7117 dip
->logical_offset
+ dip
->bytes
- 1);
7118 dio_bio
= dip
->dio_bio
;
7122 /* If we had a csum failure make sure to clear the uptodate flag */
7124 clear_bit(BIO_UPTODATE
, &dio_bio
->bi_flags
);
7125 dio_end_io(dio_bio
, err
);
7129 static void btrfs_endio_direct_write(struct bio
*bio
, int err
)
7131 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7132 struct inode
*inode
= dip
->inode
;
7133 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7134 struct btrfs_ordered_extent
*ordered
= NULL
;
7135 u64 ordered_offset
= dip
->logical_offset
;
7136 u64 ordered_bytes
= dip
->bytes
;
7137 struct bio
*dio_bio
;
7143 ret
= btrfs_dec_test_first_ordered_pending(inode
, &ordered
,
7145 ordered_bytes
, !err
);
7149 btrfs_init_work(&ordered
->work
, finish_ordered_fn
, NULL
, NULL
);
7150 btrfs_queue_work(root
->fs_info
->endio_write_workers
,
7154 * our bio might span multiple ordered extents. If we haven't
7155 * completed the accounting for the whole dio, go back and try again
7157 if (ordered_offset
< dip
->logical_offset
+ dip
->bytes
) {
7158 ordered_bytes
= dip
->logical_offset
+ dip
->bytes
-
7164 dio_bio
= dip
->dio_bio
;
7168 /* If we had an error make sure to clear the uptodate flag */
7170 clear_bit(BIO_UPTODATE
, &dio_bio
->bi_flags
);
7171 dio_end_io(dio_bio
, err
);
7175 static int __btrfs_submit_bio_start_direct_io(struct inode
*inode
, int rw
,
7176 struct bio
*bio
, int mirror_num
,
7177 unsigned long bio_flags
, u64 offset
)
7180 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7181 ret
= btrfs_csum_one_bio(root
, inode
, bio
, offset
, 1);
7182 BUG_ON(ret
); /* -ENOMEM */
7186 static void btrfs_end_dio_bio(struct bio
*bio
, int err
)
7188 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7191 btrfs_err(BTRFS_I(dip
->inode
)->root
->fs_info
,
7192 "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d",
7193 btrfs_ino(dip
->inode
), bio
->bi_rw
,
7194 (unsigned long long)bio
->bi_iter
.bi_sector
,
7195 bio
->bi_iter
.bi_size
, err
);
7199 * before atomic variable goto zero, we must make sure
7200 * dip->errors is perceived to be set.
7202 smp_mb__before_atomic();
7205 /* if there are more bios still pending for this dio, just exit */
7206 if (!atomic_dec_and_test(&dip
->pending_bios
))
7210 bio_io_error(dip
->orig_bio
);
7212 set_bit(BIO_UPTODATE
, &dip
->dio_bio
->bi_flags
);
7213 bio_endio(dip
->orig_bio
, 0);
7219 static struct bio
*btrfs_dio_bio_alloc(struct block_device
*bdev
,
7220 u64 first_sector
, gfp_t gfp_flags
)
7222 int nr_vecs
= bio_get_nr_vecs(bdev
);
7223 return btrfs_bio_alloc(bdev
, first_sector
, nr_vecs
, gfp_flags
);
7226 static inline int __btrfs_submit_dio_bio(struct bio
*bio
, struct inode
*inode
,
7227 int rw
, u64 file_offset
, int skip_sum
,
7230 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7231 int write
= rw
& REQ_WRITE
;
7232 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7236 async_submit
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
7241 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, 0);
7249 if (write
&& async_submit
) {
7250 ret
= btrfs_wq_submit_bio(root
->fs_info
,
7251 inode
, rw
, bio
, 0, 0,
7253 __btrfs_submit_bio_start_direct_io
,
7254 __btrfs_submit_bio_done
);
7258 * If we aren't doing async submit, calculate the csum of the
7261 ret
= btrfs_csum_one_bio(root
, inode
, bio
, file_offset
, 1);
7264 } else if (!skip_sum
) {
7265 ret
= btrfs_lookup_bio_sums_dio(root
, inode
, dip
, bio
,
7272 ret
= btrfs_map_bio(root
, rw
, bio
, 0, async_submit
);
7278 static int btrfs_submit_direct_hook(int rw
, struct btrfs_dio_private
*dip
,
7281 struct inode
*inode
= dip
->inode
;
7282 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7284 struct bio
*orig_bio
= dip
->orig_bio
;
7285 struct bio_vec
*bvec
= orig_bio
->bi_io_vec
;
7286 u64 start_sector
= orig_bio
->bi_iter
.bi_sector
;
7287 u64 file_offset
= dip
->logical_offset
;
7292 int async_submit
= 0;
7294 map_length
= orig_bio
->bi_iter
.bi_size
;
7295 ret
= btrfs_map_block(root
->fs_info
, rw
, start_sector
<< 9,
7296 &map_length
, NULL
, 0);
7302 if (map_length
>= orig_bio
->bi_iter
.bi_size
) {
7307 /* async crcs make it difficult to collect full stripe writes. */
7308 if (btrfs_get_alloc_profile(root
, 1) &
7309 (BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
))
7314 bio
= btrfs_dio_bio_alloc(orig_bio
->bi_bdev
, start_sector
, GFP_NOFS
);
7317 bio
->bi_private
= dip
;
7318 bio
->bi_end_io
= btrfs_end_dio_bio
;
7319 atomic_inc(&dip
->pending_bios
);
7321 while (bvec
<= (orig_bio
->bi_io_vec
+ orig_bio
->bi_vcnt
- 1)) {
7322 if (unlikely(map_length
< submit_len
+ bvec
->bv_len
||
7323 bio_add_page(bio
, bvec
->bv_page
, bvec
->bv_len
,
7324 bvec
->bv_offset
) < bvec
->bv_len
)) {
7326 * inc the count before we submit the bio so
7327 * we know the end IO handler won't happen before
7328 * we inc the count. Otherwise, the dip might get freed
7329 * before we're done setting it up
7331 atomic_inc(&dip
->pending_bios
);
7332 ret
= __btrfs_submit_dio_bio(bio
, inode
, rw
,
7333 file_offset
, skip_sum
,
7337 atomic_dec(&dip
->pending_bios
);
7341 start_sector
+= submit_len
>> 9;
7342 file_offset
+= submit_len
;
7347 bio
= btrfs_dio_bio_alloc(orig_bio
->bi_bdev
,
7348 start_sector
, GFP_NOFS
);
7351 bio
->bi_private
= dip
;
7352 bio
->bi_end_io
= btrfs_end_dio_bio
;
7354 map_length
= orig_bio
->bi_iter
.bi_size
;
7355 ret
= btrfs_map_block(root
->fs_info
, rw
,
7357 &map_length
, NULL
, 0);
7363 submit_len
+= bvec
->bv_len
;
7370 ret
= __btrfs_submit_dio_bio(bio
, inode
, rw
, file_offset
, skip_sum
,
7379 * before atomic variable goto zero, we must
7380 * make sure dip->errors is perceived to be set.
7382 smp_mb__before_atomic();
7383 if (atomic_dec_and_test(&dip
->pending_bios
))
7384 bio_io_error(dip
->orig_bio
);
7386 /* bio_end_io() will handle error, so we needn't return it */
7390 static void btrfs_submit_direct(int rw
, struct bio
*dio_bio
,
7391 struct inode
*inode
, loff_t file_offset
)
7393 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7394 struct btrfs_dio_private
*dip
;
7398 int write
= rw
& REQ_WRITE
;
7402 skip_sum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
7404 io_bio
= btrfs_bio_clone(dio_bio
, GFP_NOFS
);
7410 if (!skip_sum
&& !write
) {
7411 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
7412 sum_len
= dio_bio
->bi_iter
.bi_size
>>
7413 inode
->i_sb
->s_blocksize_bits
;
7414 sum_len
*= csum_size
;
7419 dip
= kmalloc(sizeof(*dip
) + sum_len
, GFP_NOFS
);
7425 dip
->private = dio_bio
->bi_private
;
7427 dip
->logical_offset
= file_offset
;
7428 dip
->bytes
= dio_bio
->bi_iter
.bi_size
;
7429 dip
->disk_bytenr
= (u64
)dio_bio
->bi_iter
.bi_sector
<< 9;
7430 io_bio
->bi_private
= dip
;
7432 dip
->orig_bio
= io_bio
;
7433 dip
->dio_bio
= dio_bio
;
7434 atomic_set(&dip
->pending_bios
, 0);
7437 io_bio
->bi_end_io
= btrfs_endio_direct_write
;
7439 io_bio
->bi_end_io
= btrfs_endio_direct_read
;
7441 ret
= btrfs_submit_direct_hook(rw
, dip
, skip_sum
);
7450 * If this is a write, we need to clean up the reserved space and kill
7451 * the ordered extent.
7454 struct btrfs_ordered_extent
*ordered
;
7455 ordered
= btrfs_lookup_ordered_extent(inode
, file_offset
);
7456 if (!test_bit(BTRFS_ORDERED_PREALLOC
, &ordered
->flags
) &&
7457 !test_bit(BTRFS_ORDERED_NOCOW
, &ordered
->flags
))
7458 btrfs_free_reserved_extent(root
, ordered
->start
,
7459 ordered
->disk_len
, 1);
7460 btrfs_put_ordered_extent(ordered
);
7461 btrfs_put_ordered_extent(ordered
);
7463 bio_endio(dio_bio
, ret
);
7466 static ssize_t
check_direct_IO(struct btrfs_root
*root
, int rw
, struct kiocb
*iocb
,
7467 const struct iov_iter
*iter
, loff_t offset
)
7471 unsigned blocksize_mask
= root
->sectorsize
- 1;
7472 ssize_t retval
= -EINVAL
;
7474 if (offset
& blocksize_mask
)
7477 if (iov_iter_alignment(iter
) & blocksize_mask
)
7480 /* If this is a write we don't need to check anymore */
7484 * Check to make sure we don't have duplicate iov_base's in this
7485 * iovec, if so return EINVAL, otherwise we'll get csum errors
7486 * when reading back.
7488 for (seg
= 0; seg
< iter
->nr_segs
; seg
++) {
7489 for (i
= seg
+ 1; i
< iter
->nr_segs
; i
++) {
7490 if (iter
->iov
[seg
].iov_base
== iter
->iov
[i
].iov_base
)
7499 static ssize_t
btrfs_direct_IO(int rw
, struct kiocb
*iocb
,
7500 struct iov_iter
*iter
, loff_t offset
)
7502 struct file
*file
= iocb
->ki_filp
;
7503 struct inode
*inode
= file
->f_mapping
->host
;
7507 bool relock
= false;
7510 if (check_direct_IO(BTRFS_I(inode
)->root
, rw
, iocb
, iter
, offset
))
7513 atomic_inc(&inode
->i_dio_count
);
7514 smp_mb__after_atomic();
7517 * The generic stuff only does filemap_write_and_wait_range, which
7518 * isn't enough if we've written compressed pages to this area, so
7519 * we need to flush the dirty pages again to make absolutely sure
7520 * that any outstanding dirty pages are on disk.
7522 count
= iov_iter_count(iter
);
7523 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
7524 &BTRFS_I(inode
)->runtime_flags
))
7525 filemap_fdatawrite_range(inode
->i_mapping
, offset
, count
);
7529 * If the write DIO is beyond the EOF, we need update
7530 * the isize, but it is protected by i_mutex. So we can
7531 * not unlock the i_mutex at this case.
7533 if (offset
+ count
<= inode
->i_size
) {
7534 mutex_unlock(&inode
->i_mutex
);
7537 ret
= btrfs_delalloc_reserve_space(inode
, count
);
7540 } else if (unlikely(test_bit(BTRFS_INODE_READDIO_NEED_LOCK
,
7541 &BTRFS_I(inode
)->runtime_flags
))) {
7542 inode_dio_done(inode
);
7543 flags
= DIO_LOCKING
| DIO_SKIP_HOLES
;
7547 ret
= __blockdev_direct_IO(rw
, iocb
, inode
,
7548 BTRFS_I(inode
)->root
->fs_info
->fs_devices
->latest_bdev
,
7549 iter
, offset
, btrfs_get_blocks_direct
, NULL
,
7550 btrfs_submit_direct
, flags
);
7552 if (ret
< 0 && ret
!= -EIOCBQUEUED
)
7553 btrfs_delalloc_release_space(inode
, count
);
7554 else if (ret
>= 0 && (size_t)ret
< count
)
7555 btrfs_delalloc_release_space(inode
,
7556 count
- (size_t)ret
);
7558 btrfs_delalloc_release_metadata(inode
, 0);
7562 inode_dio_done(inode
);
7564 mutex_lock(&inode
->i_mutex
);
7569 #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
7571 static int btrfs_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
7572 __u64 start
, __u64 len
)
7576 ret
= fiemap_check_flags(fieinfo
, BTRFS_FIEMAP_FLAGS
);
7580 return extent_fiemap(inode
, fieinfo
, start
, len
, btrfs_get_extent_fiemap
);
7583 int btrfs_readpage(struct file
*file
, struct page
*page
)
7585 struct extent_io_tree
*tree
;
7586 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
7587 return extent_read_full_page(tree
, page
, btrfs_get_extent
, 0);
7590 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
7592 struct extent_io_tree
*tree
;
7595 if (current
->flags
& PF_MEMALLOC
) {
7596 redirty_page_for_writepage(wbc
, page
);
7600 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
7601 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
7604 static int btrfs_writepages(struct address_space
*mapping
,
7605 struct writeback_control
*wbc
)
7607 struct extent_io_tree
*tree
;
7609 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
7610 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
7614 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
7615 struct list_head
*pages
, unsigned nr_pages
)
7617 struct extent_io_tree
*tree
;
7618 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
7619 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
7622 static int __btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
7624 struct extent_io_tree
*tree
;
7625 struct extent_map_tree
*map
;
7628 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
7629 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
7630 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
7632 ClearPagePrivate(page
);
7633 set_page_private(page
, 0);
7634 page_cache_release(page
);
7639 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
7641 if (PageWriteback(page
) || PageDirty(page
))
7643 return __btrfs_releasepage(page
, gfp_flags
& GFP_NOFS
);
7646 static void btrfs_invalidatepage(struct page
*page
, unsigned int offset
,
7647 unsigned int length
)
7649 struct inode
*inode
= page
->mapping
->host
;
7650 struct extent_io_tree
*tree
;
7651 struct btrfs_ordered_extent
*ordered
;
7652 struct extent_state
*cached_state
= NULL
;
7653 u64 page_start
= page_offset(page
);
7654 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
7655 int inode_evicting
= inode
->i_state
& I_FREEING
;
7658 * we have the page locked, so new writeback can't start,
7659 * and the dirty bit won't be cleared while we are here.
7661 * Wait for IO on this page so that we can safely clear
7662 * the PagePrivate2 bit and do ordered accounting
7664 wait_on_page_writeback(page
);
7666 tree
= &BTRFS_I(inode
)->io_tree
;
7668 btrfs_releasepage(page
, GFP_NOFS
);
7672 if (!inode_evicting
)
7673 lock_extent_bits(tree
, page_start
, page_end
, 0, &cached_state
);
7674 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
7677 * IO on this page will never be started, so we need
7678 * to account for any ordered extents now
7680 if (!inode_evicting
)
7681 clear_extent_bit(tree
, page_start
, page_end
,
7682 EXTENT_DIRTY
| EXTENT_DELALLOC
|
7683 EXTENT_LOCKED
| EXTENT_DO_ACCOUNTING
|
7684 EXTENT_DEFRAG
, 1, 0, &cached_state
,
7687 * whoever cleared the private bit is responsible
7688 * for the finish_ordered_io
7690 if (TestClearPagePrivate2(page
)) {
7691 struct btrfs_ordered_inode_tree
*tree
;
7694 tree
= &BTRFS_I(inode
)->ordered_tree
;
7696 spin_lock_irq(&tree
->lock
);
7697 set_bit(BTRFS_ORDERED_TRUNCATED
, &ordered
->flags
);
7698 new_len
= page_start
- ordered
->file_offset
;
7699 if (new_len
< ordered
->truncated_len
)
7700 ordered
->truncated_len
= new_len
;
7701 spin_unlock_irq(&tree
->lock
);
7703 if (btrfs_dec_test_ordered_pending(inode
, &ordered
,
7705 PAGE_CACHE_SIZE
, 1))
7706 btrfs_finish_ordered_io(ordered
);
7708 btrfs_put_ordered_extent(ordered
);
7709 if (!inode_evicting
) {
7710 cached_state
= NULL
;
7711 lock_extent_bits(tree
, page_start
, page_end
, 0,
7716 if (!inode_evicting
) {
7717 clear_extent_bit(tree
, page_start
, page_end
,
7718 EXTENT_LOCKED
| EXTENT_DIRTY
|
7719 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
7720 EXTENT_DEFRAG
, 1, 1,
7721 &cached_state
, GFP_NOFS
);
7723 __btrfs_releasepage(page
, GFP_NOFS
);
7726 ClearPageChecked(page
);
7727 if (PagePrivate(page
)) {
7728 ClearPagePrivate(page
);
7729 set_page_private(page
, 0);
7730 page_cache_release(page
);
7735 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
7736 * called from a page fault handler when a page is first dirtied. Hence we must
7737 * be careful to check for EOF conditions here. We set the page up correctly
7738 * for a written page which means we get ENOSPC checking when writing into
7739 * holes and correct delalloc and unwritten extent mapping on filesystems that
7740 * support these features.
7742 * We are not allowed to take the i_mutex here so we have to play games to
7743 * protect against truncate races as the page could now be beyond EOF. Because
7744 * vmtruncate() writes the inode size before removing pages, once we have the
7745 * page lock we can determine safely if the page is beyond EOF. If it is not
7746 * beyond EOF, then the page is guaranteed safe against truncation until we
7749 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
7751 struct page
*page
= vmf
->page
;
7752 struct inode
*inode
= file_inode(vma
->vm_file
);
7753 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7754 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
7755 struct btrfs_ordered_extent
*ordered
;
7756 struct extent_state
*cached_state
= NULL
;
7758 unsigned long zero_start
;
7765 sb_start_pagefault(inode
->i_sb
);
7766 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
7768 ret
= file_update_time(vma
->vm_file
);
7774 else /* -ENOSPC, -EIO, etc */
7775 ret
= VM_FAULT_SIGBUS
;
7781 ret
= VM_FAULT_NOPAGE
; /* make the VM retry the fault */
7784 size
= i_size_read(inode
);
7785 page_start
= page_offset(page
);
7786 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
7788 if ((page
->mapping
!= inode
->i_mapping
) ||
7789 (page_start
>= size
)) {
7790 /* page got truncated out from underneath us */
7793 wait_on_page_writeback(page
);
7795 lock_extent_bits(io_tree
, page_start
, page_end
, 0, &cached_state
);
7796 set_page_extent_mapped(page
);
7799 * we can't set the delalloc bits if there are pending ordered
7800 * extents. Drop our locks and wait for them to finish
7802 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
7804 unlock_extent_cached(io_tree
, page_start
, page_end
,
7805 &cached_state
, GFP_NOFS
);
7807 btrfs_start_ordered_extent(inode
, ordered
, 1);
7808 btrfs_put_ordered_extent(ordered
);
7813 * XXX - page_mkwrite gets called every time the page is dirtied, even
7814 * if it was already dirty, so for space accounting reasons we need to
7815 * clear any delalloc bits for the range we are fixing to save. There
7816 * is probably a better way to do this, but for now keep consistent with
7817 * prepare_pages in the normal write path.
7819 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
7820 EXTENT_DIRTY
| EXTENT_DELALLOC
|
7821 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
,
7822 0, 0, &cached_state
, GFP_NOFS
);
7824 ret
= btrfs_set_extent_delalloc(inode
, page_start
, page_end
,
7827 unlock_extent_cached(io_tree
, page_start
, page_end
,
7828 &cached_state
, GFP_NOFS
);
7829 ret
= VM_FAULT_SIGBUS
;
7834 /* page is wholly or partially inside EOF */
7835 if (page_start
+ PAGE_CACHE_SIZE
> size
)
7836 zero_start
= size
& ~PAGE_CACHE_MASK
;
7838 zero_start
= PAGE_CACHE_SIZE
;
7840 if (zero_start
!= PAGE_CACHE_SIZE
) {
7842 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
7843 flush_dcache_page(page
);
7846 ClearPageChecked(page
);
7847 set_page_dirty(page
);
7848 SetPageUptodate(page
);
7850 BTRFS_I(inode
)->last_trans
= root
->fs_info
->generation
;
7851 BTRFS_I(inode
)->last_sub_trans
= BTRFS_I(inode
)->root
->log_transid
;
7852 BTRFS_I(inode
)->last_log_commit
= BTRFS_I(inode
)->root
->last_log_commit
;
7854 unlock_extent_cached(io_tree
, page_start
, page_end
, &cached_state
, GFP_NOFS
);
7858 sb_end_pagefault(inode
->i_sb
);
7859 return VM_FAULT_LOCKED
;
7863 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
7865 sb_end_pagefault(inode
->i_sb
);
7869 static int btrfs_truncate(struct inode
*inode
)
7871 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7872 struct btrfs_block_rsv
*rsv
;
7875 struct btrfs_trans_handle
*trans
;
7876 u64 mask
= root
->sectorsize
- 1;
7877 u64 min_size
= btrfs_calc_trunc_metadata_size(root
, 1);
7879 ret
= btrfs_wait_ordered_range(inode
, inode
->i_size
& (~mask
),
7885 * Yes ladies and gentelment, this is indeed ugly. The fact is we have
7886 * 3 things going on here
7888 * 1) We need to reserve space for our orphan item and the space to
7889 * delete our orphan item. Lord knows we don't want to have a dangling
7890 * orphan item because we didn't reserve space to remove it.
7892 * 2) We need to reserve space to update our inode.
7894 * 3) We need to have something to cache all the space that is going to
7895 * be free'd up by the truncate operation, but also have some slack
7896 * space reserved in case it uses space during the truncate (thank you
7897 * very much snapshotting).
7899 * And we need these to all be seperate. The fact is we can use alot of
7900 * space doing the truncate, and we have no earthly idea how much space
7901 * we will use, so we need the truncate reservation to be seperate so it
7902 * doesn't end up using space reserved for updating the inode or
7903 * removing the orphan item. We also need to be able to stop the
7904 * transaction and start a new one, which means we need to be able to
7905 * update the inode several times, and we have no idea of knowing how
7906 * many times that will be, so we can't just reserve 1 item for the
7907 * entirety of the opration, so that has to be done seperately as well.
7908 * Then there is the orphan item, which does indeed need to be held on
7909 * to for the whole operation, and we need nobody to touch this reserved
7910 * space except the orphan code.
7912 * So that leaves us with
7914 * 1) root->orphan_block_rsv - for the orphan deletion.
7915 * 2) rsv - for the truncate reservation, which we will steal from the
7916 * transaction reservation.
7917 * 3) fs_info->trans_block_rsv - this will have 1 items worth left for
7918 * updating the inode.
7920 rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
7923 rsv
->size
= min_size
;
7927 * 1 for the truncate slack space
7928 * 1 for updating the inode.
7930 trans
= btrfs_start_transaction(root
, 2);
7931 if (IS_ERR(trans
)) {
7932 err
= PTR_ERR(trans
);
7936 /* Migrate the slack space for the truncate to our reserve */
7937 ret
= btrfs_block_rsv_migrate(&root
->fs_info
->trans_block_rsv
, rsv
,
7942 * setattr is responsible for setting the ordered_data_close flag,
7943 * but that is only tested during the last file release. That
7944 * could happen well after the next commit, leaving a great big
7945 * window where new writes may get lost if someone chooses to write
7946 * to this file after truncating to zero
7948 * The inode doesn't have any dirty data here, and so if we commit
7949 * this is a noop. If someone immediately starts writing to the inode
7950 * it is very likely we'll catch some of their writes in this
7951 * transaction, and the commit will find this file on the ordered
7952 * data list with good things to send down.
7954 * This is a best effort solution, there is still a window where
7955 * using truncate to replace the contents of the file will
7956 * end up with a zero length file after a crash.
7958 if (inode
->i_size
== 0 && test_bit(BTRFS_INODE_ORDERED_DATA_CLOSE
,
7959 &BTRFS_I(inode
)->runtime_flags
))
7960 btrfs_add_ordered_operation(trans
, root
, inode
);
7963 * So if we truncate and then write and fsync we normally would just
7964 * write the extents that changed, which is a problem if we need to
7965 * first truncate that entire inode. So set this flag so we write out
7966 * all of the extents in the inode to the sync log so we're completely
7969 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
7970 trans
->block_rsv
= rsv
;
7973 ret
= btrfs_truncate_inode_items(trans
, root
, inode
,
7975 BTRFS_EXTENT_DATA_KEY
);
7976 if (ret
!= -ENOSPC
) {
7981 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
7982 ret
= btrfs_update_inode(trans
, root
, inode
);
7988 btrfs_end_transaction(trans
, root
);
7989 btrfs_btree_balance_dirty(root
);
7991 trans
= btrfs_start_transaction(root
, 2);
7992 if (IS_ERR(trans
)) {
7993 ret
= err
= PTR_ERR(trans
);
7998 ret
= btrfs_block_rsv_migrate(&root
->fs_info
->trans_block_rsv
,
8000 BUG_ON(ret
); /* shouldn't happen */
8001 trans
->block_rsv
= rsv
;
8004 if (ret
== 0 && inode
->i_nlink
> 0) {
8005 trans
->block_rsv
= root
->orphan_block_rsv
;
8006 ret
= btrfs_orphan_del(trans
, inode
);
8012 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
8013 ret
= btrfs_update_inode(trans
, root
, inode
);
8017 ret
= btrfs_end_transaction(trans
, root
);
8018 btrfs_btree_balance_dirty(root
);
8022 btrfs_free_block_rsv(root
, rsv
);
8031 * create a new subvolume directory/inode (helper for the ioctl).
8033 int btrfs_create_subvol_root(struct btrfs_trans_handle
*trans
,
8034 struct btrfs_root
*new_root
,
8035 struct btrfs_root
*parent_root
,
8038 struct inode
*inode
;
8042 inode
= btrfs_new_inode(trans
, new_root
, NULL
, "..", 2,
8043 new_dirid
, new_dirid
,
8044 S_IFDIR
| (~current_umask() & S_IRWXUGO
),
8047 return PTR_ERR(inode
);
8048 inode
->i_op
= &btrfs_dir_inode_operations
;
8049 inode
->i_fop
= &btrfs_dir_file_operations
;
8051 set_nlink(inode
, 1);
8052 btrfs_i_size_write(inode
, 0);
8054 err
= btrfs_subvol_inherit_props(trans
, new_root
, parent_root
);
8056 btrfs_err(new_root
->fs_info
,
8057 "error inheriting subvolume %llu properties: %d",
8058 new_root
->root_key
.objectid
, err
);
8060 err
= btrfs_update_inode(trans
, new_root
, inode
);
8066 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
8068 struct btrfs_inode
*ei
;
8069 struct inode
*inode
;
8071 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
8078 ei
->last_sub_trans
= 0;
8079 ei
->logged_trans
= 0;
8080 ei
->delalloc_bytes
= 0;
8081 ei
->disk_i_size
= 0;
8084 ei
->index_cnt
= (u64
)-1;
8086 ei
->last_unlink_trans
= 0;
8087 ei
->last_log_commit
= 0;
8089 spin_lock_init(&ei
->lock
);
8090 ei
->outstanding_extents
= 0;
8091 ei
->reserved_extents
= 0;
8093 ei
->runtime_flags
= 0;
8094 ei
->force_compress
= BTRFS_COMPRESS_NONE
;
8096 ei
->delayed_node
= NULL
;
8098 inode
= &ei
->vfs_inode
;
8099 extent_map_tree_init(&ei
->extent_tree
);
8100 extent_io_tree_init(&ei
->io_tree
, &inode
->i_data
);
8101 extent_io_tree_init(&ei
->io_failure_tree
, &inode
->i_data
);
8102 ei
->io_tree
.track_uptodate
= 1;
8103 ei
->io_failure_tree
.track_uptodate
= 1;
8104 atomic_set(&ei
->sync_writers
, 0);
8105 mutex_init(&ei
->log_mutex
);
8106 mutex_init(&ei
->delalloc_mutex
);
8107 btrfs_ordered_inode_tree_init(&ei
->ordered_tree
);
8108 INIT_LIST_HEAD(&ei
->delalloc_inodes
);
8109 INIT_LIST_HEAD(&ei
->ordered_operations
);
8110 RB_CLEAR_NODE(&ei
->rb_node
);
8115 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
8116 void btrfs_test_destroy_inode(struct inode
*inode
)
8118 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
8119 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8123 static void btrfs_i_callback(struct rcu_head
*head
)
8125 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
8126 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8129 void btrfs_destroy_inode(struct inode
*inode
)
8131 struct btrfs_ordered_extent
*ordered
;
8132 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8134 WARN_ON(!hlist_empty(&inode
->i_dentry
));
8135 WARN_ON(inode
->i_data
.nrpages
);
8136 WARN_ON(BTRFS_I(inode
)->outstanding_extents
);
8137 WARN_ON(BTRFS_I(inode
)->reserved_extents
);
8138 WARN_ON(BTRFS_I(inode
)->delalloc_bytes
);
8139 WARN_ON(BTRFS_I(inode
)->csum_bytes
);
8142 * This can happen where we create an inode, but somebody else also
8143 * created the same inode and we need to destroy the one we already
8150 * Make sure we're properly removed from the ordered operation
8154 if (!list_empty(&BTRFS_I(inode
)->ordered_operations
)) {
8155 spin_lock(&root
->fs_info
->ordered_root_lock
);
8156 list_del_init(&BTRFS_I(inode
)->ordered_operations
);
8157 spin_unlock(&root
->fs_info
->ordered_root_lock
);
8160 if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
8161 &BTRFS_I(inode
)->runtime_flags
)) {
8162 btrfs_info(root
->fs_info
, "inode %llu still on the orphan list",
8164 atomic_dec(&root
->orphan_inodes
);
8168 ordered
= btrfs_lookup_first_ordered_extent(inode
, (u64
)-1);
8172 btrfs_err(root
->fs_info
, "found ordered extent %llu %llu on inode cleanup",
8173 ordered
->file_offset
, ordered
->len
);
8174 btrfs_remove_ordered_extent(inode
, ordered
);
8175 btrfs_put_ordered_extent(ordered
);
8176 btrfs_put_ordered_extent(ordered
);
8179 inode_tree_del(inode
);
8180 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
8182 call_rcu(&inode
->i_rcu
, btrfs_i_callback
);
8185 int btrfs_drop_inode(struct inode
*inode
)
8187 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8192 /* the snap/subvol tree is on deleting */
8193 if (btrfs_root_refs(&root
->root_item
) == 0)
8196 return generic_drop_inode(inode
);
8199 static void init_once(void *foo
)
8201 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
8203 inode_init_once(&ei
->vfs_inode
);
8206 void btrfs_destroy_cachep(void)
8209 * Make sure all delayed rcu free inodes are flushed before we
8213 if (btrfs_inode_cachep
)
8214 kmem_cache_destroy(btrfs_inode_cachep
);
8215 if (btrfs_trans_handle_cachep
)
8216 kmem_cache_destroy(btrfs_trans_handle_cachep
);
8217 if (btrfs_transaction_cachep
)
8218 kmem_cache_destroy(btrfs_transaction_cachep
);
8219 if (btrfs_path_cachep
)
8220 kmem_cache_destroy(btrfs_path_cachep
);
8221 if (btrfs_free_space_cachep
)
8222 kmem_cache_destroy(btrfs_free_space_cachep
);
8223 if (btrfs_delalloc_work_cachep
)
8224 kmem_cache_destroy(btrfs_delalloc_work_cachep
);
8227 int btrfs_init_cachep(void)
8229 btrfs_inode_cachep
= kmem_cache_create("btrfs_inode",
8230 sizeof(struct btrfs_inode
), 0,
8231 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, init_once
);
8232 if (!btrfs_inode_cachep
)
8235 btrfs_trans_handle_cachep
= kmem_cache_create("btrfs_trans_handle",
8236 sizeof(struct btrfs_trans_handle
), 0,
8237 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8238 if (!btrfs_trans_handle_cachep
)
8241 btrfs_transaction_cachep
= kmem_cache_create("btrfs_transaction",
8242 sizeof(struct btrfs_transaction
), 0,
8243 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8244 if (!btrfs_transaction_cachep
)
8247 btrfs_path_cachep
= kmem_cache_create("btrfs_path",
8248 sizeof(struct btrfs_path
), 0,
8249 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8250 if (!btrfs_path_cachep
)
8253 btrfs_free_space_cachep
= kmem_cache_create("btrfs_free_space",
8254 sizeof(struct btrfs_free_space
), 0,
8255 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8256 if (!btrfs_free_space_cachep
)
8259 btrfs_delalloc_work_cachep
= kmem_cache_create("btrfs_delalloc_work",
8260 sizeof(struct btrfs_delalloc_work
), 0,
8261 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
,
8263 if (!btrfs_delalloc_work_cachep
)
8268 btrfs_destroy_cachep();
8272 static int btrfs_getattr(struct vfsmount
*mnt
,
8273 struct dentry
*dentry
, struct kstat
*stat
)
8276 struct inode
*inode
= dentry
->d_inode
;
8277 u32 blocksize
= inode
->i_sb
->s_blocksize
;
8279 generic_fillattr(inode
, stat
);
8280 stat
->dev
= BTRFS_I(inode
)->root
->anon_dev
;
8281 stat
->blksize
= PAGE_CACHE_SIZE
;
8283 spin_lock(&BTRFS_I(inode
)->lock
);
8284 delalloc_bytes
= BTRFS_I(inode
)->delalloc_bytes
;
8285 spin_unlock(&BTRFS_I(inode
)->lock
);
8286 stat
->blocks
= (ALIGN(inode_get_bytes(inode
), blocksize
) +
8287 ALIGN(delalloc_bytes
, blocksize
)) >> 9;
8291 static int btrfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
8292 struct inode
*new_dir
, struct dentry
*new_dentry
)
8294 struct btrfs_trans_handle
*trans
;
8295 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
8296 struct btrfs_root
*dest
= BTRFS_I(new_dir
)->root
;
8297 struct inode
*new_inode
= new_dentry
->d_inode
;
8298 struct inode
*old_inode
= old_dentry
->d_inode
;
8299 struct timespec ctime
= CURRENT_TIME
;
8303 u64 old_ino
= btrfs_ino(old_inode
);
8305 if (btrfs_ino(new_dir
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
8308 /* we only allow rename subvolume link between subvolumes */
8309 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
&& root
!= dest
)
8312 if (old_ino
== BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
||
8313 (new_inode
&& btrfs_ino(new_inode
) == BTRFS_FIRST_FREE_OBJECTID
))
8316 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
8317 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
8321 /* check for collisions, even if the name isn't there */
8322 ret
= btrfs_check_dir_item_collision(dest
, new_dir
->i_ino
,
8323 new_dentry
->d_name
.name
,
8324 new_dentry
->d_name
.len
);
8327 if (ret
== -EEXIST
) {
8329 * eexist without a new_inode */
8330 if (WARN_ON(!new_inode
)) {
8334 /* maybe -EOVERFLOW */
8341 * we're using rename to replace one file with another.
8342 * and the replacement file is large. Start IO on it now so
8343 * we don't add too much work to the end of the transaction
8345 if (new_inode
&& S_ISREG(old_inode
->i_mode
) && new_inode
->i_size
&&
8346 old_inode
->i_size
> BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT
)
8347 filemap_flush(old_inode
->i_mapping
);
8349 /* close the racy window with snapshot create/destroy ioctl */
8350 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
8351 down_read(&root
->fs_info
->subvol_sem
);
8353 * We want to reserve the absolute worst case amount of items. So if
8354 * both inodes are subvols and we need to unlink them then that would
8355 * require 4 item modifications, but if they are both normal inodes it
8356 * would require 5 item modifications, so we'll assume their normal
8357 * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
8358 * should cover the worst case number of items we'll modify.
8360 trans
= btrfs_start_transaction(root
, 11);
8361 if (IS_ERR(trans
)) {
8362 ret
= PTR_ERR(trans
);
8367 btrfs_record_root_in_trans(trans
, dest
);
8369 ret
= btrfs_set_inode_index(new_dir
, &index
);
8373 BTRFS_I(old_inode
)->dir_index
= 0ULL;
8374 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
8375 /* force full log commit if subvolume involved. */
8376 btrfs_set_log_full_commit(root
->fs_info
, trans
);
8378 ret
= btrfs_insert_inode_ref(trans
, dest
,
8379 new_dentry
->d_name
.name
,
8380 new_dentry
->d_name
.len
,
8382 btrfs_ino(new_dir
), index
);
8386 * this is an ugly little race, but the rename is required
8387 * to make sure that if we crash, the inode is either at the
8388 * old name or the new one. pinning the log transaction lets
8389 * us make sure we don't allow a log commit to come in after
8390 * we unlink the name but before we add the new name back in.
8392 btrfs_pin_log_trans(root
);
8395 * make sure the inode gets flushed if it is replacing
8398 if (new_inode
&& new_inode
->i_size
&& S_ISREG(old_inode
->i_mode
))
8399 btrfs_add_ordered_operation(trans
, root
, old_inode
);
8401 inode_inc_iversion(old_dir
);
8402 inode_inc_iversion(new_dir
);
8403 inode_inc_iversion(old_inode
);
8404 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
8405 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
8406 old_inode
->i_ctime
= ctime
;
8408 if (old_dentry
->d_parent
!= new_dentry
->d_parent
)
8409 btrfs_record_unlink_dir(trans
, old_dir
, old_inode
, 1);
8411 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
8412 root_objectid
= BTRFS_I(old_inode
)->root
->root_key
.objectid
;
8413 ret
= btrfs_unlink_subvol(trans
, root
, old_dir
, root_objectid
,
8414 old_dentry
->d_name
.name
,
8415 old_dentry
->d_name
.len
);
8417 ret
= __btrfs_unlink_inode(trans
, root
, old_dir
,
8418 old_dentry
->d_inode
,
8419 old_dentry
->d_name
.name
,
8420 old_dentry
->d_name
.len
);
8422 ret
= btrfs_update_inode(trans
, root
, old_inode
);
8425 btrfs_abort_transaction(trans
, root
, ret
);
8430 inode_inc_iversion(new_inode
);
8431 new_inode
->i_ctime
= CURRENT_TIME
;
8432 if (unlikely(btrfs_ino(new_inode
) ==
8433 BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
8434 root_objectid
= BTRFS_I(new_inode
)->location
.objectid
;
8435 ret
= btrfs_unlink_subvol(trans
, dest
, new_dir
,
8437 new_dentry
->d_name
.name
,
8438 new_dentry
->d_name
.len
);
8439 BUG_ON(new_inode
->i_nlink
== 0);
8441 ret
= btrfs_unlink_inode(trans
, dest
, new_dir
,
8442 new_dentry
->d_inode
,
8443 new_dentry
->d_name
.name
,
8444 new_dentry
->d_name
.len
);
8446 if (!ret
&& new_inode
->i_nlink
== 0)
8447 ret
= btrfs_orphan_add(trans
, new_dentry
->d_inode
);
8449 btrfs_abort_transaction(trans
, root
, ret
);
8454 ret
= btrfs_add_link(trans
, new_dir
, old_inode
,
8455 new_dentry
->d_name
.name
,
8456 new_dentry
->d_name
.len
, 0, index
);
8458 btrfs_abort_transaction(trans
, root
, ret
);
8462 if (old_inode
->i_nlink
== 1)
8463 BTRFS_I(old_inode
)->dir_index
= index
;
8465 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
) {
8466 struct dentry
*parent
= new_dentry
->d_parent
;
8467 btrfs_log_new_name(trans
, old_inode
, old_dir
, parent
);
8468 btrfs_end_log_trans(root
);
8471 btrfs_end_transaction(trans
, root
);
8473 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
8474 up_read(&root
->fs_info
->subvol_sem
);
8479 static void btrfs_run_delalloc_work(struct btrfs_work
*work
)
8481 struct btrfs_delalloc_work
*delalloc_work
;
8482 struct inode
*inode
;
8484 delalloc_work
= container_of(work
, struct btrfs_delalloc_work
,
8486 inode
= delalloc_work
->inode
;
8487 if (delalloc_work
->wait
) {
8488 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
8490 filemap_flush(inode
->i_mapping
);
8491 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
8492 &BTRFS_I(inode
)->runtime_flags
))
8493 filemap_flush(inode
->i_mapping
);
8496 if (delalloc_work
->delay_iput
)
8497 btrfs_add_delayed_iput(inode
);
8500 complete(&delalloc_work
->completion
);
8503 struct btrfs_delalloc_work
*btrfs_alloc_delalloc_work(struct inode
*inode
,
8504 int wait
, int delay_iput
)
8506 struct btrfs_delalloc_work
*work
;
8508 work
= kmem_cache_zalloc(btrfs_delalloc_work_cachep
, GFP_NOFS
);
8512 init_completion(&work
->completion
);
8513 INIT_LIST_HEAD(&work
->list
);
8514 work
->inode
= inode
;
8516 work
->delay_iput
= delay_iput
;
8517 btrfs_init_work(&work
->work
, btrfs_run_delalloc_work
, NULL
, NULL
);
8522 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work
*work
)
8524 wait_for_completion(&work
->completion
);
8525 kmem_cache_free(btrfs_delalloc_work_cachep
, work
);
8529 * some fairly slow code that needs optimization. This walks the list
8530 * of all the inodes with pending delalloc and forces them to disk.
8532 static int __start_delalloc_inodes(struct btrfs_root
*root
, int delay_iput
,
8535 struct btrfs_inode
*binode
;
8536 struct inode
*inode
;
8537 struct btrfs_delalloc_work
*work
, *next
;
8538 struct list_head works
;
8539 struct list_head splice
;
8542 INIT_LIST_HEAD(&works
);
8543 INIT_LIST_HEAD(&splice
);
8545 mutex_lock(&root
->delalloc_mutex
);
8546 spin_lock(&root
->delalloc_lock
);
8547 list_splice_init(&root
->delalloc_inodes
, &splice
);
8548 while (!list_empty(&splice
)) {
8549 binode
= list_entry(splice
.next
, struct btrfs_inode
,
8552 list_move_tail(&binode
->delalloc_inodes
,
8553 &root
->delalloc_inodes
);
8554 inode
= igrab(&binode
->vfs_inode
);
8556 cond_resched_lock(&root
->delalloc_lock
);
8559 spin_unlock(&root
->delalloc_lock
);
8561 work
= btrfs_alloc_delalloc_work(inode
, 0, delay_iput
);
8562 if (unlikely(!work
)) {
8564 btrfs_add_delayed_iput(inode
);
8570 list_add_tail(&work
->list
, &works
);
8571 btrfs_queue_work(root
->fs_info
->flush_workers
,
8574 if (nr
!= -1 && ret
>= nr
)
8577 spin_lock(&root
->delalloc_lock
);
8579 spin_unlock(&root
->delalloc_lock
);
8582 list_for_each_entry_safe(work
, next
, &works
, list
) {
8583 list_del_init(&work
->list
);
8584 btrfs_wait_and_free_delalloc_work(work
);
8587 if (!list_empty_careful(&splice
)) {
8588 spin_lock(&root
->delalloc_lock
);
8589 list_splice_tail(&splice
, &root
->delalloc_inodes
);
8590 spin_unlock(&root
->delalloc_lock
);
8592 mutex_unlock(&root
->delalloc_mutex
);
8596 int btrfs_start_delalloc_inodes(struct btrfs_root
*root
, int delay_iput
)
8600 if (test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
8603 ret
= __start_delalloc_inodes(root
, delay_iput
, -1);
8607 * the filemap_flush will queue IO into the worker threads, but
8608 * we have to make sure the IO is actually started and that
8609 * ordered extents get created before we return
8611 atomic_inc(&root
->fs_info
->async_submit_draining
);
8612 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
8613 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
8614 wait_event(root
->fs_info
->async_submit_wait
,
8615 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
8616 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
8618 atomic_dec(&root
->fs_info
->async_submit_draining
);
8622 int btrfs_start_delalloc_roots(struct btrfs_fs_info
*fs_info
, int delay_iput
,
8625 struct btrfs_root
*root
;
8626 struct list_head splice
;
8629 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
8632 INIT_LIST_HEAD(&splice
);
8634 mutex_lock(&fs_info
->delalloc_root_mutex
);
8635 spin_lock(&fs_info
->delalloc_root_lock
);
8636 list_splice_init(&fs_info
->delalloc_roots
, &splice
);
8637 while (!list_empty(&splice
) && nr
) {
8638 root
= list_first_entry(&splice
, struct btrfs_root
,
8640 root
= btrfs_grab_fs_root(root
);
8642 list_move_tail(&root
->delalloc_root
,
8643 &fs_info
->delalloc_roots
);
8644 spin_unlock(&fs_info
->delalloc_root_lock
);
8646 ret
= __start_delalloc_inodes(root
, delay_iput
, nr
);
8647 btrfs_put_fs_root(root
);
8655 spin_lock(&fs_info
->delalloc_root_lock
);
8657 spin_unlock(&fs_info
->delalloc_root_lock
);
8660 atomic_inc(&fs_info
->async_submit_draining
);
8661 while (atomic_read(&fs_info
->nr_async_submits
) ||
8662 atomic_read(&fs_info
->async_delalloc_pages
)) {
8663 wait_event(fs_info
->async_submit_wait
,
8664 (atomic_read(&fs_info
->nr_async_submits
) == 0 &&
8665 atomic_read(&fs_info
->async_delalloc_pages
) == 0));
8667 atomic_dec(&fs_info
->async_submit_draining
);
8669 if (!list_empty_careful(&splice
)) {
8670 spin_lock(&fs_info
->delalloc_root_lock
);
8671 list_splice_tail(&splice
, &fs_info
->delalloc_roots
);
8672 spin_unlock(&fs_info
->delalloc_root_lock
);
8674 mutex_unlock(&fs_info
->delalloc_root_mutex
);
8678 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
8679 const char *symname
)
8681 struct btrfs_trans_handle
*trans
;
8682 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
8683 struct btrfs_path
*path
;
8684 struct btrfs_key key
;
8685 struct inode
*inode
= NULL
;
8693 struct btrfs_file_extent_item
*ei
;
8694 struct extent_buffer
*leaf
;
8696 name_len
= strlen(symname
);
8697 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
8698 return -ENAMETOOLONG
;
8701 * 2 items for inode item and ref
8702 * 2 items for dir items
8703 * 1 item for xattr if selinux is on
8705 trans
= btrfs_start_transaction(root
, 5);
8707 return PTR_ERR(trans
);
8709 err
= btrfs_find_free_ino(root
, &objectid
);
8713 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
8714 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
8715 S_IFLNK
|S_IRWXUGO
, &index
);
8716 if (IS_ERR(inode
)) {
8717 err
= PTR_ERR(inode
);
8721 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
8728 * If the active LSM wants to access the inode during
8729 * d_instantiate it needs these. Smack checks to see
8730 * if the filesystem supports xattrs by looking at the
8733 inode
->i_fop
= &btrfs_file_operations
;
8734 inode
->i_op
= &btrfs_file_inode_operations
;
8736 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
8740 inode
->i_mapping
->a_ops
= &btrfs_aops
;
8741 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
8742 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
8747 path
= btrfs_alloc_path();
8753 key
.objectid
= btrfs_ino(inode
);
8755 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
8756 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
8757 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
8761 btrfs_free_path(path
);
8764 leaf
= path
->nodes
[0];
8765 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
8766 struct btrfs_file_extent_item
);
8767 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
8768 btrfs_set_file_extent_type(leaf
, ei
,
8769 BTRFS_FILE_EXTENT_INLINE
);
8770 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
8771 btrfs_set_file_extent_compression(leaf
, ei
, 0);
8772 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
8773 btrfs_set_file_extent_ram_bytes(leaf
, ei
, name_len
);
8775 ptr
= btrfs_file_extent_inline_start(ei
);
8776 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
8777 btrfs_mark_buffer_dirty(leaf
);
8778 btrfs_free_path(path
);
8780 inode
->i_op
= &btrfs_symlink_inode_operations
;
8781 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
8782 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
8783 inode_set_bytes(inode
, name_len
);
8784 btrfs_i_size_write(inode
, name_len
);
8785 err
= btrfs_update_inode(trans
, root
, inode
);
8791 d_instantiate(dentry
, inode
);
8792 btrfs_end_transaction(trans
, root
);
8794 inode_dec_link_count(inode
);
8797 btrfs_btree_balance_dirty(root
);
8801 static int __btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
8802 u64 start
, u64 num_bytes
, u64 min_size
,
8803 loff_t actual_len
, u64
*alloc_hint
,
8804 struct btrfs_trans_handle
*trans
)
8806 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
8807 struct extent_map
*em
;
8808 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8809 struct btrfs_key ins
;
8810 u64 cur_offset
= start
;
8814 bool own_trans
= true;
8818 while (num_bytes
> 0) {
8820 trans
= btrfs_start_transaction(root
, 3);
8821 if (IS_ERR(trans
)) {
8822 ret
= PTR_ERR(trans
);
8827 cur_bytes
= min(num_bytes
, 256ULL * 1024 * 1024);
8828 cur_bytes
= max(cur_bytes
, min_size
);
8829 ret
= btrfs_reserve_extent(root
, cur_bytes
, min_size
, 0,
8830 *alloc_hint
, &ins
, 1, 0);
8833 btrfs_end_transaction(trans
, root
);
8837 ret
= insert_reserved_file_extent(trans
, inode
,
8838 cur_offset
, ins
.objectid
,
8839 ins
.offset
, ins
.offset
,
8840 ins
.offset
, 0, 0, 0,
8841 BTRFS_FILE_EXTENT_PREALLOC
);
8843 btrfs_free_reserved_extent(root
, ins
.objectid
,
8845 btrfs_abort_transaction(trans
, root
, ret
);
8847 btrfs_end_transaction(trans
, root
);
8850 btrfs_drop_extent_cache(inode
, cur_offset
,
8851 cur_offset
+ ins
.offset
-1, 0);
8853 em
= alloc_extent_map();
8855 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
8856 &BTRFS_I(inode
)->runtime_flags
);
8860 em
->start
= cur_offset
;
8861 em
->orig_start
= cur_offset
;
8862 em
->len
= ins
.offset
;
8863 em
->block_start
= ins
.objectid
;
8864 em
->block_len
= ins
.offset
;
8865 em
->orig_block_len
= ins
.offset
;
8866 em
->ram_bytes
= ins
.offset
;
8867 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
8868 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
8869 em
->generation
= trans
->transid
;
8872 write_lock(&em_tree
->lock
);
8873 ret
= add_extent_mapping(em_tree
, em
, 1);
8874 write_unlock(&em_tree
->lock
);
8877 btrfs_drop_extent_cache(inode
, cur_offset
,
8878 cur_offset
+ ins
.offset
- 1,
8881 free_extent_map(em
);
8883 num_bytes
-= ins
.offset
;
8884 cur_offset
+= ins
.offset
;
8885 *alloc_hint
= ins
.objectid
+ ins
.offset
;
8887 inode_inc_iversion(inode
);
8888 inode
->i_ctime
= CURRENT_TIME
;
8889 BTRFS_I(inode
)->flags
|= BTRFS_INODE_PREALLOC
;
8890 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
8891 (actual_len
> inode
->i_size
) &&
8892 (cur_offset
> inode
->i_size
)) {
8893 if (cur_offset
> actual_len
)
8894 i_size
= actual_len
;
8896 i_size
= cur_offset
;
8897 i_size_write(inode
, i_size
);
8898 btrfs_ordered_update_i_size(inode
, i_size
, NULL
);
8901 ret
= btrfs_update_inode(trans
, root
, inode
);
8904 btrfs_abort_transaction(trans
, root
, ret
);
8906 btrfs_end_transaction(trans
, root
);
8911 btrfs_end_transaction(trans
, root
);
8916 int btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
8917 u64 start
, u64 num_bytes
, u64 min_size
,
8918 loff_t actual_len
, u64
*alloc_hint
)
8920 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
8921 min_size
, actual_len
, alloc_hint
,
8925 int btrfs_prealloc_file_range_trans(struct inode
*inode
,
8926 struct btrfs_trans_handle
*trans
, int mode
,
8927 u64 start
, u64 num_bytes
, u64 min_size
,
8928 loff_t actual_len
, u64
*alloc_hint
)
8930 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
8931 min_size
, actual_len
, alloc_hint
, trans
);
8934 static int btrfs_set_page_dirty(struct page
*page
)
8936 return __set_page_dirty_nobuffers(page
);
8939 static int btrfs_permission(struct inode
*inode
, int mask
)
8941 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8942 umode_t mode
= inode
->i_mode
;
8944 if (mask
& MAY_WRITE
&&
8945 (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
))) {
8946 if (btrfs_root_readonly(root
))
8948 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_READONLY
)
8951 return generic_permission(inode
, mask
);
8954 static int btrfs_tmpfile(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
8956 struct btrfs_trans_handle
*trans
;
8957 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
8958 struct inode
*inode
= NULL
;
8964 * 5 units required for adding orphan entry
8966 trans
= btrfs_start_transaction(root
, 5);
8968 return PTR_ERR(trans
);
8970 ret
= btrfs_find_free_ino(root
, &objectid
);
8974 inode
= btrfs_new_inode(trans
, root
, dir
, NULL
, 0,
8975 btrfs_ino(dir
), objectid
, mode
, &index
);
8976 if (IS_ERR(inode
)) {
8977 ret
= PTR_ERR(inode
);
8982 ret
= btrfs_init_inode_security(trans
, inode
, dir
, NULL
);
8986 ret
= btrfs_update_inode(trans
, root
, inode
);
8990 inode
->i_fop
= &btrfs_file_operations
;
8991 inode
->i_op
= &btrfs_file_inode_operations
;
8993 inode
->i_mapping
->a_ops
= &btrfs_aops
;
8994 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
8995 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
8997 ret
= btrfs_orphan_add(trans
, inode
);
9001 d_tmpfile(dentry
, inode
);
9002 mark_inode_dirty(inode
);
9005 btrfs_end_transaction(trans
, root
);
9008 btrfs_balance_delayed_items(root
);
9009 btrfs_btree_balance_dirty(root
);
9014 static const struct inode_operations btrfs_dir_inode_operations
= {
9015 .getattr
= btrfs_getattr
,
9016 .lookup
= btrfs_lookup
,
9017 .create
= btrfs_create
,
9018 .unlink
= btrfs_unlink
,
9020 .mkdir
= btrfs_mkdir
,
9021 .rmdir
= btrfs_rmdir
,
9022 .rename
= btrfs_rename
,
9023 .symlink
= btrfs_symlink
,
9024 .setattr
= btrfs_setattr
,
9025 .mknod
= btrfs_mknod
,
9026 .setxattr
= btrfs_setxattr
,
9027 .getxattr
= btrfs_getxattr
,
9028 .listxattr
= btrfs_listxattr
,
9029 .removexattr
= btrfs_removexattr
,
9030 .permission
= btrfs_permission
,
9031 .get_acl
= btrfs_get_acl
,
9032 .set_acl
= btrfs_set_acl
,
9033 .update_time
= btrfs_update_time
,
9034 .tmpfile
= btrfs_tmpfile
,
9036 static const struct inode_operations btrfs_dir_ro_inode_operations
= {
9037 .lookup
= btrfs_lookup
,
9038 .permission
= btrfs_permission
,
9039 .get_acl
= btrfs_get_acl
,
9040 .set_acl
= btrfs_set_acl
,
9041 .update_time
= btrfs_update_time
,
9044 static const struct file_operations btrfs_dir_file_operations
= {
9045 .llseek
= generic_file_llseek
,
9046 .read
= generic_read_dir
,
9047 .iterate
= btrfs_real_readdir
,
9048 .unlocked_ioctl
= btrfs_ioctl
,
9049 #ifdef CONFIG_COMPAT
9050 .compat_ioctl
= btrfs_ioctl
,
9052 .release
= btrfs_release_file
,
9053 .fsync
= btrfs_sync_file
,
9056 static struct extent_io_ops btrfs_extent_io_ops
= {
9057 .fill_delalloc
= run_delalloc_range
,
9058 .submit_bio_hook
= btrfs_submit_bio_hook
,
9059 .merge_bio_hook
= btrfs_merge_bio_hook
,
9060 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
9061 .writepage_end_io_hook
= btrfs_writepage_end_io_hook
,
9062 .writepage_start_hook
= btrfs_writepage_start_hook
,
9063 .set_bit_hook
= btrfs_set_bit_hook
,
9064 .clear_bit_hook
= btrfs_clear_bit_hook
,
9065 .merge_extent_hook
= btrfs_merge_extent_hook
,
9066 .split_extent_hook
= btrfs_split_extent_hook
,
9070 * btrfs doesn't support the bmap operation because swapfiles
9071 * use bmap to make a mapping of extents in the file. They assume
9072 * these extents won't change over the life of the file and they
9073 * use the bmap result to do IO directly to the drive.
9075 * the btrfs bmap call would return logical addresses that aren't
9076 * suitable for IO and they also will change frequently as COW
9077 * operations happen. So, swapfile + btrfs == corruption.
9079 * For now we're avoiding this by dropping bmap.
9081 static const struct address_space_operations btrfs_aops
= {
9082 .readpage
= btrfs_readpage
,
9083 .writepage
= btrfs_writepage
,
9084 .writepages
= btrfs_writepages
,
9085 .readpages
= btrfs_readpages
,
9086 .direct_IO
= btrfs_direct_IO
,
9087 .invalidatepage
= btrfs_invalidatepage
,
9088 .releasepage
= btrfs_releasepage
,
9089 .set_page_dirty
= btrfs_set_page_dirty
,
9090 .error_remove_page
= generic_error_remove_page
,
9093 static const struct address_space_operations btrfs_symlink_aops
= {
9094 .readpage
= btrfs_readpage
,
9095 .writepage
= btrfs_writepage
,
9096 .invalidatepage
= btrfs_invalidatepage
,
9097 .releasepage
= btrfs_releasepage
,
9100 static const struct inode_operations btrfs_file_inode_operations
= {
9101 .getattr
= btrfs_getattr
,
9102 .setattr
= btrfs_setattr
,
9103 .setxattr
= btrfs_setxattr
,
9104 .getxattr
= btrfs_getxattr
,
9105 .listxattr
= btrfs_listxattr
,
9106 .removexattr
= btrfs_removexattr
,
9107 .permission
= btrfs_permission
,
9108 .fiemap
= btrfs_fiemap
,
9109 .get_acl
= btrfs_get_acl
,
9110 .set_acl
= btrfs_set_acl
,
9111 .update_time
= btrfs_update_time
,
9113 static const struct inode_operations btrfs_special_inode_operations
= {
9114 .getattr
= btrfs_getattr
,
9115 .setattr
= btrfs_setattr
,
9116 .permission
= btrfs_permission
,
9117 .setxattr
= btrfs_setxattr
,
9118 .getxattr
= btrfs_getxattr
,
9119 .listxattr
= btrfs_listxattr
,
9120 .removexattr
= btrfs_removexattr
,
9121 .get_acl
= btrfs_get_acl
,
9122 .set_acl
= btrfs_set_acl
,
9123 .update_time
= btrfs_update_time
,
9125 static const struct inode_operations btrfs_symlink_inode_operations
= {
9126 .readlink
= generic_readlink
,
9127 .follow_link
= page_follow_link_light
,
9128 .put_link
= page_put_link
,
9129 .getattr
= btrfs_getattr
,
9130 .setattr
= btrfs_setattr
,
9131 .permission
= btrfs_permission
,
9132 .setxattr
= btrfs_setxattr
,
9133 .getxattr
= btrfs_getxattr
,
9134 .listxattr
= btrfs_listxattr
,
9135 .removexattr
= btrfs_removexattr
,
9136 .update_time
= btrfs_update_time
,
9139 const struct dentry_operations btrfs_dentry_operations
= {
9140 .d_delete
= btrfs_dentry_delete
,
9141 .d_release
= btrfs_dentry_release
,